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A large hat manufacturer, DAVIDS HATS, is concerned that the mean weight of their signature Kentucky Derby hat is not greater than 3.5 pounds. It can be assumed that the population standard deviation is .7 pounds based on past experience. A sample of 350 hats is selected and the sample mean is 3.25 pounds. Using a level of significance of .10, is there evidence that the population mean weight of the hats is greater than 3.5 pounds? Fully explain your answer.
Linda would like to maintain a 90% service level. what safety stock level do you recommend for BX-5?
Identify the null hypothesis, alternative hypothesis, test statistic, P-value and conclusion about the null hypothesis. Use the P-value method.
She believes that the number of customers served on weekdays follows a normal distribution. Construct an 99% confidence interval of the average number of customers served on weekdays.
Suppose the probability of a boy being born is the same as the probability of a girl being born. Find the probability that a family with three children will have two boys and one girl.
If you randomly select ten m&m's, what is the probability that exactly three of them are green?
In the past, Bly has tended to estimate warranty expenses on the high end to be conservative. He must work with the dealership's accountant at year-end to arrive at the warranty expense accrual for cars sold each year.
A student population consists of 55% females and 45% males. A researcher recorded the gender of each student emerging from a theater and found a total of 385 females and 215 males.
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
A sample of 40 ovservations is selected from one population. The sample mean is 102 and the sample standard deviation is 5. A sample of 50 observers is selected from a second population.
Listed below are weights in grams from a sample of these bats. Construct a 95% confidence interval estimate of their mean weight.
A car rental office checks out an average of 30 cars per day with a standard deviation of 8 cars. If a sample of 25 days of operation is selected and the sample mean is computed.
According to the Bureau of Economic Analysis, the savings rate of American households, defined as a percentage of the disposable personal income, was 4.20% in 2009.
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