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If you have a population mean of 50 and a population standard deviation of 5 and you select a sample size of 100, what is the probability that the sample mean is between 47 and 49.5?
What is the difference between the R and R-squared terms? What does each tell you? How large should the R-squared term be if you want to show that the two variables are practically related?
Suppose a stock analyst wants to determine whether there is a difference in the mean rate of returns for three types of stock - utility, retail, and banking.
The study was done to distinguish people's religion with how many days that they have said they have been calm in past three days. Determine proportion of Catholics were calm for 1 out of 3 days?
Given are the numbers of times the machine was used over each of the last 30 days. Find out the mean number of times the machine was used per day.
Determine the 90% confidence interval for average days worked by employees in all payroll departments?
Suppose that the population follows the normal distribution. Forty trucks are randomly selected and weighed. Within what limits will 95 percent of the sample means occur?
Find the mean number of radioactive atoms lost through decay in a day. Find the probability that on a given day, 50 radioactive atoms decayed.
a) Find the marginal density of Y. b) Find E(X) HINT: What is E (X|Y=y) ?
A coin is tossed 100 times. The difference "number of heads - number of tails" is like the sum of 100 draws from one of the following boxes. which one, and why?
Drawing the standard normal curve and indicating the area representing the probability and
Student volunteers in a weight loss project were randomly assigned to one of three diets. After 2 months on the diets, subjects were weighed and weight loss was recorded for each person.
Suppose that daily gross income is normally distributed. Determine the relative frequency corresponding to daily gross income of $520 or more?
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