The bonus of the staff of the company is under the normal distribution. The bonuses of the 26 employees are randomly selected and the following data were received: ∑ ? = 6448 ; ∑ ?2 = 1650000. Find a 90% confidence interval for the population mean
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A: We have to test claim.
The bonus of the staff of the company is under the
the 26 employees are randomly selected and the following data were received:
∑ ? = 6448 ; ∑ ?2 = 1650000. Find a 90% confidence interval for the population mean
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- The scores of a standarlized test form a normal distribution with a mean of 300 and standard deviation of 40. what are the lower and upper quartile scores for this test.To become an actuary, it is necessary to pass a series of 10 exams, including the most important one, an exam in probability and statistics. An insurance company wants to estimate the mean score on this exam for actuarial students who have enrolled in a special study program. They take a sample of 8 actuarial students in this program and find the mean of the sample is 6.0 with standard deviation of the sample 2.0. This sample will be used to calculate a 95% confidence interval for the mean score for actuarial students in the special study program. The critical value used in constructing a 95% confidence interval is ________. Question 16 options: 1) 1.8595 2) 3.4995 3) 2.3646 4) 1.8946The sizes of houses in Kenton County are normally distributed with a mean of 1369 square feet with a standard deviation of 171 square feet. For a randomly selected house in Kenton County, what is the probability the house size is over 1158 square feet? z = probability =
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