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Question1 A market researcher wants to study TV viewing habits of residents in a particular area....

Question1

A market researcher wants to study TV viewing habits of residents in a particular area. A random sample 0f 70 respondents is selected. The results are as follows

Viewing time per week Mean=14 hours, S=3.8 hours

50 respondents watch the evening news on at least three week nights

(a)      Construct a 90% confidence interval estimate for the mean amount of TV watched per week.

(b)      Construct a 95% CI estimate of population proportion who watches evening news on at least three week nights.

Question 2

Following data gives the amount that a sample of 10 customers spent for lunch ($) at a fast food restaurant:

$8.50, $7, $5.80,  $9, $5.60,  $7.80,  $6.50, $5.40,  $7.50,  $5.50

Construct a 95% confidence interval estimate for the population mean amount spent on lunch at the fast food restaurant.

Question 3

A cell phone provider has the business objective of wanting to estimate the proportion of subscribers who would upgrade to a new cell phone with improved features if it were made available at a substantially reduced cost. Data are collected from a random sample of 500 subscribers. The results indicated that 135 of the subscribers would upgrade to a new cell phone at a reduced cost. Construct a 95% confidence interval estimate for the population proportion of subscribers that would upgrade to a new cell phone at a reduced cost.

Question 4

You are the manager of a restaurant for a fast food. Last month the mean waiting time at the drive through window for branches in your region was 3.8 minutes. You select a random sample of 49 orders. The sample mean waiting time is 3.57 minutes, with a sample standard deviation of 0.8 minutes. At the .05 level of significance is there evidence that population mean waiting time is different from 3.8 minutes?

Solutions

Expert Solution

Question 1

a) Given Sample n =70

Mean=14 hours,

S=3.8 hours

90% confidence interval estimate for the mean amount of TV watched per week.

b) 95% CI estimate of population proportion who watches evening news on at least three week nights

*** Dear student we answer one question once post remaining separately****   

milcah answered 2 months ago
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