Introduction to Probability and Statistics
14th Edition
ISBN: 9781133103752
Author: Mendenhall, William
Publisher: Cengage Learning
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Chapter 12.7, Problem 12.46E
a)
To determine
To estimate: The average number of passing number of yards for games in which Brees throws 20 completed passing using a 95% confidence interval
b)
To determine
To predict: The average number of passing number of yards for games in which Brees throws 20 completed passing using a 95% confidence interval
c)
To determine
To explain: Whether least square line from exercise 12.45 could be used to find the Brees’ total number of passing yards for a game in which he threw only five completed passes.
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A well-known brokerage firm executive claimed that 40% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 500 people, 37% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is smaller than 40% at the 0.005 significance level.The null and alternative hypothesis would be:
H0:p≥0.4H0:p≥0.4H1:p<0.4H1:p<0.4
H0:μ≥0.4H0:μ≥0.4H1:μ<0.4H1:μ<0.4
H0:μ=0.4H0:μ=0.4H1:μ≠0.4H1:μ≠0.4
H0:μ≤0.4H0:μ≤0.4H1:μ>0.4H1:μ>0.4
H0:p≤0.4H0:p≤0.4H1:p>0.4H1:p>0.4
H0:p=0.4H0:p=0.4H1:p≠0.4H1:p≠0.4
The test is:
left-tailed
two-tailed
right-tailed
The test statistic is: (to 3 decimals)The p-value is: (to 4 decimals)Based on this we:
Fail to reject the null hypothesis
Reject the null hypothesis
The cost of making a batch of a certain product depends on the size of the batch, as shown by the following sample data:
Cost $
30
70
140
270
530
1010
2000
5100
size of the batch
1
5
10
25
50
100
250
500
a) Fit a straight line to said data, with the least squares method, use the lot size as the independent variable.
b) Find a 95% confidence interval for alfa that can be interpreted as the fixed overhead cost of manufacture.
A well-known brokerage firm executive claimed that 80% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 100 people, 79% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is smaller than 80% at the 0.025 significance level.The null and alternative hypothesis would be:
H0:p=0.8H0:p=0.8H1:p≠0.8H1:p≠0.8
H0:μ=0.8H0:μ=0.8H1:μ≠0.8H1:μ≠0.8
H0:μ≥0.8H0:μ≥0.8H1:μ<0.8H1:μ<0.8
H0:μ≤0.8H0:μ≤0.8H1:μ>0.8H1:μ>0.8
H0:p≤0.8H0:p≤0.8H1:p>0.8H1:p>0.8
H0:p≥0.8H0:p≥0.8H1:p<0.8H1:p<0.8
The test is:
right-tailedtwo-tailedleft-tailed
The test statistic is:_______________ (to 3 decimals)The p-value is:_____________ (to 4 decimals)
Chapter 12 Solutions
Introduction to Probability and Statistics
Ch. 12.4 - Prob. 12.1ECh. 12.4 - Prob. 12.2ECh. 12.4 - Prob. 12.3ECh. 12.4 - Prob. 12.4ECh. 12.4 - Prob. 12.5ECh. 12.4 - You are given five points with these coordinates:...Ch. 12.4 - Prob. 12.7ECh. 12.4 - Prob. 12.8ECh. 12.4 - Prob. 12.9ECh. 12.4 - Prob. 12.10E
Ch. 12.4 - Prob. 12.11ECh. 12.4 - Prob. 12.12ECh. 12.4 - Prob. 12.13ECh. 12.4 - Prob. 12.14ECh. 12.4 - Prob. 12.15ECh. 12.4 - Prob. 12.16ECh. 12.4 - Prob. 12.17ECh. 12.5 - Prob. 12.19ECh. 12.5 - Prob. 12.20ECh. 12.5 - Prob. 12.21ECh. 12.5 - Prob. 12.22ECh. 12.5 - Prob. 12.23ECh. 12.5 - Prob. 12.24ECh. 12.5 - Professor Asimov, continued Refer to thedata in...Ch. 12.5 - Prob. 12.26ECh. 12.5 - Prob. 12.27ECh. 12.5 - Prob. 12.28ECh. 12.5 - Prob. 12.29ECh. 12.5 - Prob. 12.30ECh. 12.6 - Prob. 12.34ECh. 12.6 - Prob. 12.35ECh. 12.6 - Prob. 12.36ECh. 12.6 - Prob. 12.37ECh. 12.6 - Prob. 12.38ECh. 12.7 - Refer to Exercise 12.7. Portions of the MINITAB...Ch. 12.7 - Prob. 12.41ECh. 12.7 - Prob. 12.42ECh. 12.7 - Prob. 12.43ECh. 12.7 - Prob. 12.44ECh. 12.7 - Prob. 12.45ECh. 12.7 - Prob. 12.46ECh. 12.8 - Prob. 12.50ECh. 12.8 - Prob. 12.51ECh. 12.8 - Prob. 12.52ECh. 12.8 - Prob. 12.53ECh. 12.8 - Prob. 12.55ECh. 12.8 - Prob. 12.56ECh. 12.8 - Prob. 12.58ECh. 12.8 - Baseball Stats Does a team’s batting average...Ch. 12 - Prob. 12.62SECh. 12 - Prob. 12.63SECh. 12 - Prob. 12.65SECh. 12 - Prob. 12.66SECh. 12 - Prob. 12.67SECh. 12 - Tennis, Anyone? If you play tennis, you know that...Ch. 12 - Prob. 12.69SECh. 12 - Prob. 12.70SECh. 12 - Prob. 12.71SECh. 12 - Movie Reviews How many weeks cana movie run and...Ch. 12 - In addition to increasingly large bounds onerror,...Ch. 12 - Prob. 12.74SECh. 12 - Prob. 12.76SECh. 12 - Prob. 1CSCh. 12 - Prob. 2CSCh. 12 - Prob. 3CS
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- A well-known brokerage firm executive claimed that 90% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 500 people, 86% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is smaller than 90% at the 0.005 significance level.The null and alternative hypothesis would be: H0:μ≥0.9H0:μ≥0.9H1:μ<0.9H1:μ<0.9 H0:μ=0.9H0:μ=0.9H1:μ≠0.9H1:μ≠0.9 H0:p≤0.9H0:p≤0.9H1:p>0.9H1:p>0.9 H0:μ≤0.9H0:μ≤0.9H1:μ>0.9H1:μ>0.9 H0:p≥0.9H0:p≥0.9H1:p<0.9H1:p<0.9 H0:p=0.9H0:p=0.9H1:p≠0.9H1:p≠0.9 The test is: two-tailed right-tailed left-tailed The test statistic is: (to 3 decimals)The p-value is: (to 4 decimals)Based on this we: Reject the null hypothesis Fail to reject the null hypothesisarrow_forwardA well-known brokerage firm executive claimed that 10% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 600 people, 1% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is smaller than 10% at the 0.025 significance level.The null and alternative hypothesis would be: H0:p≥0.1H1:p<0.1 H0:p=0.1 H1:p≠0.1 H0:μ≤0.1H1:μ>0.1 H0:μ=0.1H1:μ≠0.1 H0:p≤0.1H1:p>0.1 H0:μ≥0.1H1:μ<0.1 The test is: right-tailed two-tailed left-tailed The test statistic is: (to 3 decimals)The p-value is: (to 4 decimals)Based on this we: Fail to reject the null hypothesis Reject the null hypothesisarrow_forwardA well-known brokerage firm executive claimed that 10% of investors are currently confident of meeting their investment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sample of 200 people, 19% of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is larger than 10% at the 0.005 significance level.The null and alternative hypothesis would be: H0:p≥0.1H0:p≥0.1H1:p<0.1H1:p<0.1 H0:p≤0.1H0:p≤0.1H1:p>0.1H1:p>0.1 H0:μ≤0.1H0:μ≤0.1H1:μ>0.1H1:μ>0.1 H0:p=0.1H0:p=0.1H1:p≠0.1H1:p≠0.1 H0:μ≥0.1H0:μ≥0.1H1:μ<0.1H1:μ<0.1 H0:μ=0.1H0:μ=0.1H1:μ≠0.1H1:μ≠0.1 The test is: two-tailed left-tailed right-tailed The test statistic is: (to 3 decimals)The p-value is: (to 4 decimals)Based on this we: Fail to reject the null hypothesis Reject the null hypothesisarrow_forward
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