Question

IDENTIFYING THE METHOD OF ANALYSIS In Evercises Ci to C8,identify the method of analysis needed to answer the question. Indicate whether we should conduct a hypothesis test or find a confidence interval and also indicate whether the analysis will be done on a proportion, a mean, a difference in proportions, a difference in means, or a matched pairs difference in means. C.2 Use results collected at a supermarket to see whether there is a difference in the average amount of time customers have to wait in line between two different check-out cashiers. C.4 Use data collected at an online shopping site to estimate the proportion of people visiting the site who make a purc C.s Use data collected from a sample of applicants at a college admissions office to measure how large the difference is in the average size of the financial aid package between early decision applicants and regular decision applicants. Answer Solution

Answer 1

c.2 Here we have given two check out cashiers.

We can test here two population means.

Two different groups are there.

So here we will use two sample test either z or t.

If sample size is greator than 30 and population standard deviation is known then we use z-test otherwise we use t-test.

c.4 Here we have given information about single proportion. Data will be collected at an online shopping site to estimate the proportion of people visiting the site who make a purchase.

We can test here single proportion.

So here we use one sample proportion z test.

c.5 Here again we have given two groups which are early decision applicants and regular decision applicants.

We can test here difference in two population means.

So we can apply here two sample t test or two sample z test.

If sample size is greator than 30 and population standard deviation is known then we use z-test otherwise we use t-test.