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Category > Math Posted 23 Apr 2017 My Price 8.00

Compute the z or t value of the sample test statistic

 

Part 1 of 3 -

Question 1 of 20 1.0 Points
Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance.

Compute the z or t value of the sample test statistic.  
 A.z = 1.96
 B.t = 1.645
 C.z = 0.69
 D.z = 0.62
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Question 2 of 20 1.0 Points
If a teacher is trying to prove that a new method of teaching economics is more effective than a traditional one, he/she will conduct a:
 A.one-tailed test
 B.point estimate of the population parameter
 C.two-tailed test
 D.confidence interval
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Question 3 of 20 1.0 Points
The alternative hypothesis is also known as the:
 A.elective hypothesis
 B.optional hypothesis
 C.research hypothesis
 D.null hypothesis
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Question 4 of 20 1.0 Points
You conduct a hypothesis test and you observe values for the sample mean and sample standard deviation when n = 25 that do not lead to the rejection of H0. You calculate a p-value of 0.0667. What will happen to the p-value if you observe the same sample mean and standard deviation for a sample size larger than 25?
 A.The p – value may increase or decrease
 B.The p – value increases
 C.The p – value stays the same
 D.The p – value decreases
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Question 5 of 20 1.0 Points
Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance.

What is your conclusion?
 A.Reject H0. There is enough evidence to support the claim that the proportion of students planning to go to college is now greater than .79.
 B.More seniors are going to college
 C.Cannot determine
 D.Do not reject H0. There is not enough evidence to support the claim that the proportion of students planning to go to college is greater than .79.
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Question 6 of 20 1.0 Points
Suppose that the mean time for a certain car to go from 0 to 60 miles per hour was 7.7 seconds. Suppose that you want to test the claim that the average time to accelerate from 0 to 60 miles per hour is longer than 7.7 seconds. What would you use for the alternative hypothesis?
 A.H1:  = 7.7 seconds
 B.H1: < 7.7 seconds
 C.H1:  > 7.7 seconds
 D.H1: 7.7 seconds
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Question 7 of 20 1.0 Points
Results from previous studies showed 79% of all high school seniors from a certain city plan to attend college after graduation. A random sample of 200 high school seniors from this city reveals that 162 plan to attend college. Does this indicate that the percentage has increased from that of previous studies? Test at the 5% level of significance. 

State the null and alternative hypotheses.
 A.H0: m = .79, H1: m > .79
 B.H0: p = .79, H1: p ≠ .79
 C.H0: p ≤ .79, H1: p > .79
 D. H0:    = .79, H1:  > .79
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Question 8 of 20 1.0 Points
A null hypothesis can only be rejected at the 5% significance level if and only if:
 A.a 95% confidence interval does not include the hypothesized value of the parameter
 B.the null hypotheses includes sampling error
 C.a 95% confidence interval includes the hypothesized value of the parameter
 D.the null hypothesis is biased
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Question 9 of 20 1.0 Points
The hypothesis that an analyst is trying to prove is called the:
 A.level of significance
 B.alternative hypothesis
 C.elective hypothesis
 D.quality of the researcher
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Question 10 of 20 1.0 Points

 A lab technician is tested for her consistency by taking multiple measurements of cholesterol levels from the same blood sample. The target accuracy is a variance in measurements of 1.2 or less. If the lab technician takes 16 measurements and the variance of the measurements in the sample is 2.2, does this provide enough evidence to reject the claim that the lab technician’s accuracy is within the target accuracy?

At the a = .01 level of significance, what is your conclusion?

 A.Do not reject H0. At the  = .01 level of significance there is not sufficient evidence to suggest that this technician’s true variance is greater than the target accuracy. 
 B.         Reject H0.  At the  = .01 level of significance, there is not enough evidence to support the claim that this technician’s true variance is larger than the target accuracy.
 C.Reject H0. At the  = .01 level of significance, there is enough evidence to support the claim that this technician’s variance is larger than the target accuracy.
 D.Cannot determine
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Question 11 of 20 1.0 Points
In an article appearing in Today’s Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75, a nutritionist selected a random sample of 20 servings of popcorn and computed the sample mean number of calories per serving to be 78 with a sample standard deviation of 7.
At the a = .05 level of significance, does the nutritionist have enough evidence to reject the writer’s claim?
 A.Yes
 B.Cannot Determine
 C.No
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Part 2 of 3 -

Question 12 of 20 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

A statistician wishes to test the claim that the standard deviation of the weights of firemen is less than 25 pounds. To do so, she selected a random sample of 20 firemen and found s = 23.2 pounds. 

Assuming that the weights of firemen are normally distributed, if the statistician wanted to test her research hypothesis at the .05 level of significance, what is the critical value? 

Place your answer, rounded to 3 decimal places, in the blank. For example, 12.345 would be a legitimate entry.  

Question 13 of 20 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

Let x be a random variable representing dividend yield of Australian bank stocks. We may assume that x has a normal distribution with  = 2.8%. A random sample of 16 Australian bank stocks has a sample mean dividend yield of 8.91%. For the entire Australian stock market, the mean dividend yield is  = 6.4%. If you wanted to test, at a .05 level of significance, to determine if these data indicate that the dividend yield of all Australian bank stocks is higher than 6.4% what is the critical value that you would use? Place your answer, rounded to 2 decimal places, in the blank. For example, 2.34 would be a legitimate entry.  

Question 14 of 20 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

A survey determines that mint chocolate chip is the favorite ice cream flavor of 6% of consumers. An ice cream shop determines that of 190 customers, 15 customers stated their preference for mint chocolate chip. 

Find the P-value that would be used to determine if the percentage of customers who prefer mint chocolate chip ice has increased at a 5% level of significance. 

P-value:  Round your answer to four decimal places as necessary. 

Question 15 of 20 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

At a university, the average cost of books per student has been $550 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than $550.  He surveys a sample of 40 students and finds that for the most recent semester their average cost was $630 with a standard deviation of $120.  What is the test value for this hypothesis test? 

Test value:  Round your answer to two decimal places as necessary. 

Question 16 of 20 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

At a university, the average cost of books per student has been $400 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than $400.  He surveys a sample of 40 students and finds that for the most recent semester their average cost was $430 with a standard deviation of $80.  What is the test value for this hypothesis test? 

Test value:  Round your answer to two decimal places as necessary. 

Question 17 of 20 1.0 Points
Accepted characters: numbers, decimal point markers (period or comma), sign indicators (-), spaces (e.g., as thousands separator, 5 000), "E" or "e" (used in scientific notation). NOTE: For scientific notation, a period MUST be used as the decimal point marker. 
Complex numbers should be in the form (a + bi) where "a" and "b" need to have explicitly stated values. 
For example: {1+1i} is valid whereas {1+i} is not. {0+9i} is valid whereas {9i} is not. 

At a university, the average cost of books per student has been $600 per student per semester. The Dean of Students believes that the costs are increasing and that the average is now greater than $600.  He surveys a sample of 40 students and finds that for the most recent semester their average cost was $645 with a standard deviation of $75.  What is the test value for this hypothesis test? 

Test value:  Round your answer to two decimal places as necessary. 

Part 3 of 3 -

Question 18 of 20 1.0 Points
In order to determine the p-value, it is unnecessary to know the level of significance.
 True
 False
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Question 19 of 20 1.0 Points
The probability of making a Type I error and the level of significance are the same.
 True
 False
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Question 20 of 20 1.0 Points
If a null hypothesis about a population mean is rejected at the 0.025 level of significance, then it must also be rejected at the 0.01 level.
 True
 False
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Answers

(11)
Status NEW Posted 23 Apr 2017 11:04 AM My Price 8.00

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