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The shape of the distribution of the time required to get an oil change at a 10 minute oil change facility is unknown. However, records indicate that the mean time is 11.2 minutes and the standard deviation is 4.8 minutes (a) to compute probabilities regarding the sample mean using the normal model, what size sample would be required? (b) What is the probability that a random sample of n=45 oil changes results in a sample mean time less than 10 minutes?
What is your null hypothesis? What is your alternative hypothesis? What your decision about the null hypothesis?
By using the normal distribution to approximate the desired probability.
suppose that 88 of college men and 82 of college women were employed last summer. a sample survey interviews
What percentage of personal checking account customers carry average daily balances in excess of $800? What percentage of the banks customers carries average daily balances below of $200?
Using the .05 significance level, can we conclude that there is a positive association between the two variables?
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
The test question was if this difference between the test statistics and the stated life of the battery was significant? The .05 significant level was selected for the test. Which is the correct statement?
you just saw an ad on television that states the majority of the population would vote to make smoking illegal. the
fatal errors that require a system reboot occur an average of 7 times per week. the system runs 24 hours a day 7 days a
the average expenditure on valentines day was expected to be 100.89 usa today february 13 2006. do male and female
Describe the following correlation. The students with the highest grades in written French were also the students with the highest grade in spoken French.
Assume that sigma = 60, choose an alpha level, and perform a hypothesis test to determine whether this is good evidence to conclude that the mean score for all young men is less than 275.
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