Construct a 95% confidence interval for the mean charitable
Refer to Exercise 13.83. Construct a 95% confidence interval for the mean charitable contributions made by all households with an income of $84,000. Make a 95% prediction interval for the charitable contributions made by a randomly selected household with an income of $84,000.
Exercise 13.83:
The following table gives information on the incomes (in thousands of dollars) and charitable contributions (in hundreds of dollars) for the last year for a random sample of 10 households.
a. With income as an independent variable and charitable contributions as a dependent variable, compute SSxx, SSyy, and SSxy.
b. Find the regression of charitable contributions on income.
c. Briefly explain the meaning of the values of a and b.
d. Calculate r and r2Â and briefly explain what they mean.
e. Compute the standard deviation of errors.
f. Construct a 99% confidence interval for B.
g. Test at the 1% significance level whether B is positive.
h. Using the 1% significance level, can you conclude that the linear correlation coefficient is different from zero?
Â
Answers
Status NEW
Posted 07 May 2017 06:05 PM
My Price 7.00
-----------
Attachments
file 1494182118-2086705_1_636296912457580359_2086705.xlsx preview (147 words )
Re-----------fer----------- to----------- Ex-----------erc-----------ise----------- 13-----------.83-----------. C-----------ons-----------tru-----------ct -----------a 9-----------5% -----------con-----------fid-----------enc-----------e i-----------nte-----------rva-----------l f-----------or -----------the----------- me-----------an -----------cha-----------rit-----------abl-----------e c-----------ont-----------rib-----------uti-----------ons----------- ma-----------de -----------by -----------all----------- ho-----------use-----------hol-----------ds -----------wit-----------h a-----------n i-----------nco-----------me -----------of -----------$84-----------,00-----------0. -----------Mak-----------e a----------- 95-----------% p-----------red-----------ict-----------ion----------- in-----------ter-----------val----------- fo-----------r t-----------he -----------cha-----------rit-----------abl-----------e c-----------ont-----------rib-----------uti-----------ons----------- ma-----------de -----------by -----------a r-----------and-----------oml-----------y s-----------ele-----------cte-----------d h-----------ous-----------eho-----------ld -----------wit-----------h a-----------n i-----------nco-----------me -----------of -----------$84-----------,00-----------0.E-----------xer-----------cis-----------e 1-----------3.8-----------3:T-----------he -----------fol-----------low-----------ing----------- ta-----------ble----------- gi-----------ves----------- in-----------for-----------mat-----------ion----------- on----------- th-----------e i-----------nco-----------mes----------- (i-----------n t-----------hou-----------san-----------ds -----------of -----------dol-----------lar-----------s) -----------and----------- ch-----------ari-----------tab-----------le -----------con-----------tri-----------but-----------ion-----------s (-----------in -----------hun-----------dre-----------ds -----------of -----------dol-----------lar-----------s) -----------for-----------
Not Rated(0)