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Information from AAA indicates that the mean age of passenger cars in the US is 8.4 years. A sample of 40 cars in the student lots at the local university showed the mean age to be 9.2 years. The standard deviation of this sample was 2.8 years. At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students?
a. Compute the value of the test statistic.
b. What is your decision regarding the null hypothesis?
c. Interpret your decision from part e in a single sentence.
Is it reasonable typical worker does not miss any days during a pay period?
Answer all of these questions using R Commander. Include all graphs, outputs from R Commander.
What extremely important characteristic of the data set is not considered in the hypothesis test?
Evaluate the standard deviation - use the conservative value for the degrees of freedom, Assume the two groups are independent and the data are approximately Normal. Let µ 1 and µ 2 represent the mean heart rates we would observe for the entire po..
A fair die is rolled nine times. What is the probability that an odd number (1,3 or 5) will occur less than 3 times?
An exam consists of 10 true or false questions. If a student guesses at every answer, what is the probability that he or she will answer exactly six questions correctly? (Round the answer to three decimal places)
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
What is the null hypothesis? Use α =0.05. Compute critical value. Use α =0.05.
Answer to a problem based on statistical graphics.Create a c-bar chart and determine if corrective action is needed.
What is the probability that a roulette ball will come to rest on an even number other than 0 and 00?
The alternative hypothesis is true. In this case the consumer advocacy group will have, A consumer advocacy group doubts this claim and tests the hypotheses
Make your calculation supposing a two-sided two-sample t-test with a type I error (alpha) of 0.056
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