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The mean amount purchased by a typical customer at Churchill's Grocery Store is $23.50 with a standard deviation of $5.00. Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the following questions.
a. What is the likelihood the sample mean is at least $25.00?b. What is the likelihood the sample mean is greater than $22.50 but less than $25.00?c. Within what limits will 90 percent of the sample means occur?
Probability is 0.5% that home will suffer the 50% loss due to fire. If we ignore all other partial losses, what premium must insurance company charge for policy just to break even?
Sketch a scatter plot that could represent data from each of following. Label the axes to indicate the independent and dependent variable.
A radio station in Myrtle Beach announced that at least 90% of the hotels and motels would be full for the Memorial Day weekend. The station advised listeners to make reservations in advance if they planned to be in the resort over the weekend.
The following data are from two separate samples. Does it appear that these two samples came from the same population or from two different populations?
An electric utility wishes to examine the relationship between temperature and electricity use in its service region during the summer months.
A study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least 6 months to individuals following a conventional (low fat, low calorie )diet for at least 6 months.
Significance level to test the claim that less than half (.5) of all executives identify that error as being the most common job interviewing error.
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
If a random sample of 36 lobster fishermen is selected, what is the probability that their average catch is less than 31.5 pounds? Assume the distribution of the weights of lobster is normal.
He measured whether their answers to a standard set of mental problems were affected. His approach to manipulating his independent variable involved
The Internal Revenue Service (IRS) provides a toll-free help line for taxpayers to call in and get answers to questions as they prepare their tax returns.
A group of three students is to be randomly selected froma group of 1 freshman, 1 sophomore, 3 juniors and 3 seniors. Let Y1 and Y2 denote the number of juniors and seniors, a) What is the joint probability distribution for Y1 and Y2?
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