# Question

A survey of your customers shows, to your surprise, that 42 out of 200 randomly selected customers were not satisfied with after-sale support and service.

a. Find the summary statistics: the sample size, n; the sample percentage, p; and the standard error, Sp.

b. Find the two-sided 95% confidence interval for the percent dissatisfied among all of your customers (i.e., not just those surveyed).

c. Your population consists of 28,209 customers. Convert the percentages representing the endpoints of the confidence interval in part b to numbers of people in the population. State and interpret your result as a confidence interval for the population number of dissatisfied customers.

a. Find the summary statistics: the sample size, n; the sample percentage, p; and the standard error, Sp.

b. Find the two-sided 95% confidence interval for the percent dissatisfied among all of your customers (i.e., not just those surveyed).

c. Your population consists of 28,209 customers. Convert the percentages representing the endpoints of the confidence interval in part b to numbers of people in the population. State and interpret your result as a confidence interval for the population number of dissatisfied customers.

## Answer to relevant Questions

A sample of 93 coils of sheet steel showed that the average length was 101.37 meters, with a standard deviation of 2.67 meters. a. Interpret the standard deviation in words; in particular, what is it measuring the ...A random sample of 50 recent patient records at a clinic shows that the average billing per visit was $53.01 and the standard deviation was $16.48. a. Find the 95% confidence interval for the mean and interpret it. b. Find ...Production yield data with 17 degrees of freedom have been collected. Find the appropriate t value from the t table to use for each of the following confidence interval calculations: a. One-sided 95% confidence. b. One-sided ...Repeat exercise 1 using a 95% confidence interval for a different random sample: employee numbers 4, 47, 45, 12, and 69. Also, answer the following: a. Find the average, standard deviation, and standard error for annual ...a. What is a paired t test? b. Identify the two hypotheses involved in a paired t test. c. What is the “pairing” requirement? Give a concrete example. d. How is a paired t test similar to and different from an ordinary t ...Post your question

0