Question 205041This question is from textbook
: I am so stuck on these 4 questions. I have read and read and still don't get them. Any help is appreciated. Thank you so much.
1. A machine produces 3-inch nails. A sample of 12 nails was selected and the lengths determined. The results are as follows:
2.89 2.95 3.00 3.05 2.99 2.96 3.10 3.06 3.00 3.12 3.00 2.95
Use these results to test H0: = 3 and Ha: 3 at = 0.05. Give the critical region, the computed test statistic, and the conclusion
2. A random sample of 46 observations was selected from a normally distributed population. The sample mean was = 81, and the sample variance was s2 = 35.0. Does the sample show sufficient reason to conclude that the population standard deviation is not equal to 7 at the 0.05 level of significance? Use the p-value method.
3. An insurance company states that 75% of its claims are settled within 5 weeks. A consumer group selected a random sample of 50 of the company’s claims and found 35 of the claims were settled within 5 weeks. Is there enough evidence to support the consumer group’s claim that fewer than 75% of the claims were settled within 5 weeks? Test using the traditional approach with = 0.05.
4. A machine produces 9 inch latex gloves. A sample of 80 gloves is selected, and it is found that 20 are shorter than they should be. Find the 99% confidence interval on the proportion of all such gloves that are shorter than 9 inches
This question is from textbook
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! If you look at your post you will see that some of the
data statements are not readable. I would suggest that
you post each problem separately and make sure the posts
are readable.
Cheers,
Stan H.
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