1

The scatterplot below charts the performance of an electric motor.

Which answer choice correctly indicates the explanatory variable and the response variable of the scatterplot?

•          

Explanatory variable: Voltage

Response variable: Electric motor

•          

Explanatory variable: Rotation

Response variable: Electric motor

•          

Explanatory variable: Rotation

Response variable: Voltage

•          

Explanatory variable: Voltage

Response variable: Rotation

2

The blood bank at a hospital has 1,200 units of blood, out of which 37% units are of blood group B+. A clinical researcher randomly selects 300 units of blood and finds that 33% of those are of blood group B+. To test his result, he randomly selects 200 units of blood and finds that 40% of those are of blood group B+.

Which of the following is the reason there is a difference between the two percentages selected by the researcher?

•          

The samples were not random samples.

•          

The sample sizes were both too small.

•          

Random error; the numbers were different due to variability inherent in sampling.

•          

Both samples suffered from non-response bias.

3

Select the statement that is FALSE.

•          

The mean is never greater than the greatest value of a data set.

•          

The interquartile range is the difference between the highest and lowest values in the middle of a data set.

•          

The range is never greater than the greatest value of a data set.

•          

The range is the difference between the largest and smallest values of a data set.

4

A table represents the number of students who passed or failed an aptitude test at two different campuses.

            East Campus   West Campus

Passed 39        45

Failed  61        55

 

In order to determine if there is a significant difference between campuses and pass rate, the chi-square test for association and independence should be performed.

What is the expected frequency of East Campus and passed?

•          

39 students

•          

48.3 students

•          

42 students

•          

50.5 students

5

Which of the following is an example of a false positive?

•          

Test results confirm that a patient does not have cancer.

•          

Test results confirm that a patient has cancer.

•          

Test results indicate that a patient does not have cancer when, in fact, he does.

•          

Test results indicate that a patient has cancer when, in fact, he does not.

6

The following shows the Consumer Price Index (CPI) for the years 2000-2005. All of the values use a reference year of 1983.

 

Which of the following is true about the CPI, based on the information?

•          

$100 in 2000 would be equivalent to $189.7 in 2004

•          

$100 in 1983 would be equivalent to $189.70 in 2004

•          

$100 in 2002 would be equivalent to $189.70 in 2004

•          

$100 in 2004 would have been worth 189.70 in 1983.

7

Which of the following data types will be continuous?

•          

Cost of a can of tuna fish

•          

Number of people in a family

•          

Height of a toddler

•          

Number of chairs in a house

8

Carl throws a single die twice in a row. For the first throw, Carl rolled a 2; for the second throw he rolled a 4.

What is the probability of rolling a 2 and then a 4?  Answer choices are in the form of a percentage, rounded to the nearest whole number.

•          

36%

•          

33%

•          

3%

•          

22%

9

Shawna reads a scatterplot that displays the relationship between the number of cars owned per household and the average number of citizens who have health insurance in neighborhoods across the country. The plot shows a strong positive correlation.

Shawna recalls that correlation does not imply causation. In this example, Shawna sees that increasing the number of cars per household would not cause members of her community to purchase health insurance.

Identify the lurking variable that is causing an increase in both the number of cars owned and the average number of citizens with health insurance. 

•          

The number of cars on the road

•          

Average income per household

•          

Average mileage per vehicle

•          

The number of citizens in the United States

10

The formula for the standard deviation of a sample is:

 

 

Select the true statement for the following data set that has a mean of 6.75:

 

4, 6, 7, 10

 

Answer choices are rounded to the hundredths place.

•          

The variance is 6.25 and the standard deviation is 2.50.

•          

The variance is 4.71 and the standard deviation is 2.17.

•          

The variance is 2.50 and the standard deviation is 6.50.

•          

The variance is 6.75 and the standard deviation is 6.25.

11

James conducts a survey to study the relationship between cell phone use and grades earned during the fall semester. James suspects that there might be a lot of other factors that affect grades besides cell phones. 

Which of the following could be a confounding variable in James's study?

•          

Grade earned during the fall semester

•          

Grade earned during the spring semester

•          

Time spent using a cell phone

•          

Time spent studying

12

This chart shows the number of students of different age groups who participated in a quiz.

 

Which of the following statements about the stack plot is true?

•          

There were more students in the age group 15-17 than in any other age group.

•          

There were more male students in the age group 19-21 than in the age group 15-17.

•          

There were more male students than female students in the age group 19-21.

•          

There were more female students in the age group 17-19 than in any other age group.

13

A coin is tossed 50 times, and the number of times heads comes up is counted.

Which of the following statements about the distributions of counts and proportions is FALSE?

•          

The distribution of the count of getting tails can be approximated with a normal distribution.

•          

The distribution of the count of getting heads can be approximated with a normal distribution.

•          

The count of getting heads from a sample proportion of size 20 can be approximated with a normal distribution.

•          

The count of getting heads is a binomial distribution.

14

Joe hypothesizes that the average age of the population of Florida is less than 37 years. He records a sample mean equal to 37 and states the hypothesis as  μ = 37 vs  μ  < 37.

What type of test should Joe do?

•          

Right-tailed test

•          

Two-tailed test

•          

Joe should not do any of the types of tests listed

•          

Left-tailed test

15

A bag holds 20 red marbles and 40 green ones, for a total of 60 marbles. Ryan picks one marble from the bag at random, hoping to pick a red marble.

Which of the following statements is true? 

•          

The probability that Ryan will pick a red marble on the first try is 67%.  If he keeps this marble and picks another from the bag, the probability that he will pick a green marble decreases.

•          

The probability that Ryan will pick a red marble on the first try is 33%.  If he keeps this marble and picks another from the bag, the probability that he will pick a green marble decreases.

•          

The probability that Ryan will pick a red marble on the first try is 33%.  If he keeps this marble and picks another from the bag, the probability that he will pick a green marble increases.

•          

The probability that Ryan will pick a red marble on the first try is 67%.  If he keeps this marble and picks another from the bag, the probability that he will pick a green marble increases.

16

Using this Venn diagram, what is the probability that event A or event B occurs?

•          

0.41

•          

0.36

•          

0.68

•          

0.77

17

The manager of an amusement park conducts a survey among the people visiting the park to learn their favorite rides. Out of 100 people randomly selected to complete the survey, 25 people have chosen not to participate.

The manager's survey suffers from which of the following types of bias?

•          

Selection bias

•          

Nonresponse bias

•          

There is no bias in the way this survey is carried out.

•          

Response bias

18

What value of z* should be used to construct an 88% confidence interval of a population mean? Answer choices are rounded to the thousandths place.

•          

1.645

•          

1.220

•          

1.175

•          

1.555

19

For this scatterplot, the r2 value was calculated to be 0.9382.

Which of the following set of statements is true?

•          

About 94% of the variation in beach visitors is explained by a negative linear relationship with daily temperatures.

The correlation coefficient, r, is 0.969.

•          

About 94% of the variation in beach visitors can be explained by a positive linear relationship with daily temperature.

The correlation coefficient, r, is 0.969.

•          

There is no strong correlation in the linear association between beach visitors and daily temperatures.

The correlation coefficient, r, is 0.880

•          

About 94% of the variation in daily temperature can be explained by a positive linear relationship with beach visitors.

The correlation coefficient, r, is 0.880

20

Jake tosses a coin and rolls a six-sided die.

All of the following are possible outcomes EXCEPT:

•          

Tails, Three

•          

Heads, Seven

•          

Heads, Five

•          

Tails, One

21

Which of the following statements is true?

•          

If the variance of a data set is 25, the standard deviation is 12.5.

•          

If the variance of a data set is 25, the standard deviation is 50.

•          

If the variance of a data set is 25, the standard deviation is 625.

•          

If the variance of a data set is 25, the standard deviation is 5.

22

Adam tabulated the values for the average speed on each day of his road trip as 60.5, 63.2, 54.7, 51.6, 72.3, 70.7, 67.2, and 65.4 mph.

If Adam wanted to construct a one-sample t-statistic, what would the value for the degrees of freedom be?

•          

8

•          

9

•          

4

•          

7

23

Dave drives to work. While driving the car over nine days, he observes his daily average speed and lists it in the table below.

Day     Average Speed

(MPH)

1          45

2          62

3          44

4          70

5          59

6          66

7          54

8          63

9          67

The median speed at which Dave drove to work was __________.

•          

62 miles per hour

•          

58.89 miles per hour

•          

59 miles per hour

•          

63 miles per hour

24

In a survey of small business owners, a response to which of the following questions would be qualitative?

•          

How many businesses do you own?

•          

What type of business do you own?

•          

How long have you owned a business?

•          

How much did your business have in profits last year?

25

Shawna finds a study of American women that has an equation to predict weight (in pounds) from height (in inches): ŷ = -260 + 6.6x. Shawna's mom’s height is 68 inches and her weight is 179 pounds.

What is the residual of weight and height for Shawna's mom?

•          

-9.8 pounds

•          

9.8 pounds

•          

188.8 pounds

•          

921.4 pounds

 

 

SmartExpert

(118)

Status NEW Posted 25 Apr 2020 01:04 PM My Price 25.00

MAT----------- 30-----------0 F-----------ina-----------l E-----------xam----------- So-----------phi-----------a-----------

Attachments

file 1587822445-MAT 300 Final Exam Sophia.docx preview (2654 words )

1----------- T-----------he -----------sca-----------tte-----------rpl-----------ot -----------bel-----------ow -----------cha-----------rts----------- th-----------e p-----------erf-----------orm-----------anc-----------e o-----------f a-----------n e-----------lec-----------tri-----------c m-----------oto-----------r.W-----------hic-----------h a-----------nsw-----------er -----------cho-----------ice----------- co-----------rre-----------ctl-----------y i-----------ndi-----------cat-----------es -----------the----------- ex-----------pla-----------nat-----------ory----------- va-----------ria-----------ble----------- an-----------d t-----------he -----------res-----------pon-----------se -----------var-----------iab-----------le -----------of -----------the----------- sc-----------att-----------erp-----------lot-----------? ----------- -----------Exp-----------lan-----------ato-----------ry -----------var-----------iab-----------le:----------- Vo-----------lta-----------ge ----------- Re-----------spo-----------nse----------- va-----------ria-----------ble-----------: E-----------lec-----------tri-----------c m-----------oto-----------r ----------- E-----------xpl-----------ana-----------tor-----------y v-----------ari-----------abl-----------e: -----------Rot-----------ati-----------on ----------- Re-----------spo-----------nse----------- va-----------ria-----------ble-----------: E-----------lec-----------tri-----------c m-----------oto-----------r ----------- E-----------xpl-----------ana-----------tor-----------y v-----------ari-----------abl-----------e: -----------Rot-----------ati-----------on ----------- Re-----------spo-----------nse----------- va-----------ria-----------ble-----------: V-----------olt-----------age----------- ----------- Ex-----------pla-----------nat-----------ory----------- va-----------ria-----------ble-----------: V-----------olt-----------age----------- R-----------esp-----------ons-----------e v-----------ari-----------abl-----------e:

Not Rated(0)

• Buy Answer