1. In considering the production of a new car accessory, the Michigan Manufacturer Company wants to do a marketing study to determine the proportion of cars with cellular phones. How many cars must be sampled to have 92% confidence that the sample proportion is in error by no more than 0.03? The answer is 851 need help setting up and solving to get this.

2. the data set show 17 weights (in grams) of red M & M's. For the sample, the mean is 0.9043g and the standard deviation is 0.0414g. Construct a 90% confidence interval estimate of the standard deviation of the weights of all red M & M's. answer is 0.0323 < o < 0.0587.

Data 17 weights of red m & m's
0.864
0.952
o.941
0.817
0.957
0.920
0.958
0.933
0.870
0.871
0.921
0.896
0.913
0.844
0.931
0.909
0.876

3.Total weights of garbage discarded by 62 households in one week. For the sample the mean is 27.44lb and the SD is 12.46lb. Construct a 99% confidence interval estimate of standard deviation for the weights of the garbage discarded by all households.
answer is 10.15 < o < 16.33

data set has 37 households in set
42.99
51.90
20.20
36.80
19.02
15.43
20.71
17.01
45.35
49.37
18.06
17.41
23.67
19.13
20.99
21.18
29.06
14.95
4.43
24.82
20.80
25.79
14.62
28.41
27.17
54.47
13.12
45.77
34.79
37.26
51.58
24.81
26.18
11.25
28.15
11.14
11.70

Solution Summary

The solution gives complete steps of construction of confidence interval for mean and proportion.

The width of a confidenceinterval estimate for a proportion will be:
A. narrower for 99% confidence than for 95% confidence
B. wider for a sample size of 100 than for a sample size of 50
C. narrower for 90% confidence than for 95% confidence
D. narrower when the sample proportion is 0.50 than when the sample proportion is

M&M Project: Part 3
Use the M&M data to complete this assignment. StatCrunch can be used to assist with the calculations. A link for StatCrunch can be found under Tools for Success in Course Home. Here is also a link:
http://statcrunch.pearsoncmg.com/statcrunch/larson_les4e/dataset/index.html. Submit your answers in Exce

We will be constructing confidenceintervals for the proportion of each color as well as the mean number of candies per bag.
Construct a 95% ConfidenceIntervalfor the proportion of blue M&Ms® candies.
Construct a 95% ConfidenceIntervalfor the proportion of orange M&Ms® candies.
Construct a 95% Confidence Interva

The sale manager for a hardware wholesaler finds that 229 of the previous 500 calls to the hardware store owners resulted in new product placements. Assume these 500 calls represent a random sample.
a. What is the upper confidence limit of a 95% confidenceintervalfor the population proportion of new product placements?
b.

ConfidenceInterval
I need help setting up and solving a confidenceinterval problem. The problem is set out below and is set out in the attached excel spread sheet.
INSTRUCTION:
Include a "summary statement" for each CI.
PROBLEM:
Find a 69% CI for the population proportion of successes when a sample of 57 had 32

Schadek Silkscreen Printing, Inc. purchases plastic cups on which to print logos for sporting events, proms, birthdays, and other special occasions. Zack Schadek, the owner, received a large shipment this morning. To ensure the quality of the shipment, he selected a random sample of 300 cups. He found 15 to be defective.
a.

in order to determine the population proportion of pizza restaurants that offer a salad bar a random sample of 1250 of these restaurants was selected from across the us.
if 997 of the sampled restaurants offered a salad bar, construct and explain a 95% interval estimate of the proportion of all pizza restaurants in the us with

It was found that in a sample of 90 teenage boys, 70 % of them have received speeding tickets. What is the 90% confidenceinterval of the true proportion of teenage boys who have received speeding tickets?
a. 0.591 < p < 0.812
b. 0.615 < p < 0.805
c. 0.620 < p < 0.780
d. 0.584 < p < 0.830

In a random sample of 225 students at a university, 180 stated that they were nonsmokers. Based on this sample, compute a 95% confidenceintervalfor the proportion of all students at the university who are nonsmokers.
Carry your intermediate computations to at least three decimal places. Round your answers to two decimal pl