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# Section 11.5 Exercise 13-TQuestion Holpsurvey 0f 25 randomly sclocted customers found the ag0s shown (in years) . The mean Is 31.60 years and the standard deviation...

## Question

###### Section 11.5 Exercise 13-TQuestion Holpsurvey 0f 25 randomly sclocted customers found the ag0s shown (in years) . The mean Is 31.60 years and the standard deviation is 91 years: a) Construct 80% confidence interval Ior the mean ag0 of all customers , assuming that tho assumptions and conditions for the confidence interval have been met; D) How large tho margin 0f emor? c) How would the confidence Interval change you had assumed that the standard deviation was krown to be 10.0 years?385] 3322 1

Section 11.5 Exercise 13-T Question Holp survey 0f 25 randomly sclocted customers found the ag0s shown (in years) . The mean Is 31.60 years and the standard deviation is 91 years: a) Construct 80% confidence interval Ior the mean ag0 of all customers , assuming that tho assumptions and conditions for the confidence interval have been met; D) How large tho margin 0f emor? c) How would the confidence Interval change you had assumed that the standard deviation was krown to be 10.0 years? 385] 3322 16 47 27 33 31 21 What ( Ine coniidence interval? (28.99 34.21 Section 11.7 Exercise 20 Question Help A random sample of the amounts for 18 purchases was taken. The mean was S42.93,the standard deviation was S22.39, and the margin of error for a 95% confidence interval was 511.13_ Assume that tn 2.0 for the 95% confidence intervals . a) To reduce the margin of error to about S5, how large would the sample size have t0 be? b) How large would the sample size have to be to reduce the margin of error to S1.1? a) The new sample size should be (Round up t0 the nearest integer:)  #### Similar Solved Questions

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