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Perform the following steps:
a. state the hypotheses and identify the claim.b. find the critical valuesc. compute the test valued. make the decision.e. summarize the results.
The dean of students wants to see ehether there is a significant difference in ages of resident students and commuting students. She selects a sample of 50 students from each group. The ages are shown below.
Resident Students22 25 27 23 26 28 26 24 25 2026 24 27 26 18 19 18 30 26 1818 19 32 23 19 19 18 29 19 2218 22 26 19 19 21 23 18 20 1822 21 19 21 21 22 18 20 19 23Commuter Students18 20 19 18 22 25 24 35 23 1823 22 28 25 20 24 26 30 22 2522 21 18 20 19 26 35 19 19 1819 32 29 23 21 19 36 27 27 2020 21 18 19 23 20 19 19 20 25
At a = 0.05, decide if there is enough evidence to reject the claim of no difference in the ages fo the two groups. Compute and use the standard deviations from the samples.
What is the decision regarding the null hypothesis (is there a difference in the mean numbers of cameras sold at the three department store chains)?
The probability distribution for the possible results of an experiment is given, Determine the mean of the distribution.
The weights of canned hams processed at Henline Ham Company follow the normal distribution, with a mean of 9.20 pounds and a standard deviation of .25 pounds. The label weight is given as 9.00 pounds
A mean of 6.7 minutes and a standard deviation of 2.2 minutes. For a door selected at random, what is the probability the assembly time will be 5 minutes or less?
Randomly selected statistics students were given five seconds to estimate the value of a product of numbers with a summary of the results of both groups given below.
A number of minor automobile accidents occur at various high-risk intersections in Teton County despite traffic lights. The Traffic Department claims that a modification in the type of light will reduce these accidents.
Determine the mean and standard error of the x - bar distribution.
The US Mint selects ten pennies from the production line to test the hypothesis that the mean weight of each penny is 5 grams. The normally-distributed weights (in grams) of these pennies are as follows:
In the following questions, you should demonstrate your understanding of sampling distribution:
Why are estimations and confidence intervals important? Do confidence intervals and estimation play a role in the selection of sample size?
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
The US Census Bureau announce that the median sales price of new houses sold in April 2009 was $221,600 while the mean sales price was $274,300. Assume that the standard deviation of the prices is $90,000.
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