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At a large department store, the average nmber of yeard of employment for a cahiser is 5.7 with a standard deviation of 1.8 years, and the distribution is approximately normal. if an employee is picked at random, what is the probability that the employee has worked at the store for over 10 years?
A discrete random variable Y takes the value -1, 0 and 1 with probabilities 1/2θ, 1- θ and 1/2θ respectively. Let Y1 and Y2 be two independent random variables, each with the same distribution as Y.
The probabilities of low, medium and high compliance are 0.3, 0.4, and 0.3, respectively
Determine proportion of patients have glucose levels exceeding 115? If the patient has glucose level of 140, what percentile is this?
Assume that the significance level is a= 0.1. Use the given information to find the p-value and the critical value (s). With H1: p = with line through it 1/2 the test statistic is z= - 1.35
The mathematics SAT scores of the seven students in a mathematics seminar are 533, 553, 578, 586, 619, 626, and 633. Suppose that the student with the score of 533 drops the seminar and is replaced by a student with a score of 765.
What is the purpose of the F test in a multiple regression? What is a qualitative independent variable? How would we/what technique would we use to include a qualitative independent variable in a regression model.
Explain the relationship between sample size and the likelihood of a statistically significant difference between the measured values of two groups.
What was the success probability of each O-ring?
Many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. One way to do this is to convert numeric grades to z scores using the mean and standard deviation for the grades, then use an equation s..
Find the t c for a 90% confidence level with a sample size of 18.
The average height of american woman is distributed normally, with a mean of 63.5 inches and a standard deviation 2.5 inches. Approximately what percentage of american women are taller than 58.5 inches,
Employ a four period moving average and determine the forecasted demand for August. Put your answer in the form xx.x with no additional numbers or symbols.
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