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Q1) Cell phone manufacturer claims that its phone will last for more than 8 hours of continuous talk time when battery is fully charged. To test this claim a sample of n = 18 phones were tested. Results showed sample mean of 8.2 hours and sample standard deviation of 0.4 hours. Carry out hypothesis test using 0.05 level of significance and find out whether or not company's claim is supported.
Q2) Major tire manufacturer wants to evaluate mean tread life in miles for one of their tires. They want to develop confidence interval estimate that would have maximum sampling error of 500 miles with 90 percent confidence. Pilot sample of n = 50 tires illustrated sample standard deviation equal to 4,000 miles. Based on this information, required sample size is:
a) 124.
b) 246.
c)174.
d) 196.
Consider a hypothesis test that uses a 0.05 significance level to test the claim that the mean body tem of the population is less than 98.6
If a card is drawn at random from a standard 52-card deck, what is the probability that the card drawn is one of the following?
A processor of carrots cuts green top off each carrot, washes the carrots, and inserts six to a package. Twenty packages are inserted in a box for shipment. To test weight of the boxes, a few were checked.
If a single test is run and indicates that oil is present, what is the revised probability that oil is actually present?
Find the alternative would be chosen according to expected value and utility.
Determine fraction of employees cost between $1,500 and $2,000 per year?
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
what percent of the total number of seeds germinated?
If hypothesis test for single population variance is to be conducted by using significance level of to 0.10, a sample size of n = 16, and test is a one-tailed upper-tail test, the critical value is?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
A bookcase contains 3 statistics books and 4 biology books. If 2 books are chosen at random, find the chance that both are statistics books.
Of the adults in Jefferson County, 10 percent have had CPR training. For a randomly selected group of students from this county, how large will the group have to be in order for the probability that have as a minimum one group member has had CPR t..
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