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A production line makes units with a mean weight of 80 g and standard deviation of 5 g. What is the probability that a sample of 100 units has a mean weight of less than 79 g?
A machine makes parts with a variance of 14.5 cm in length. A random sample of 50 parts has a mean length of 106.5 cm. What are the 95% and 99% confidence intervals for the length of parts?
Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
A study of accounts receivable at the A&W Department Store indicates that bills are either current, one month overdue, two months overdue, written off as bad debts, or paid in full.
In a test of the independence of two variables, one of the variables has two possible categories and the other has three possible categories.
Compute the mean, median, and mode. Which of these measures of central tendency do you think most accurately describes the lifestyle variable you are looking at?
how would i set up the following stats questions of the households in the u.s 18 million or 17 have 3 or more
For a hypothesis test about a population proportion or mean, if the level of significance is less than the p-value, the null hypothesis is rejected.
A sample is selected from a population with a mean of =40 and a standard deviation of 8. If the sample has n=4 scores, what is the expected value of M and the standard error of M?
the probability that an individual has 20-20 vision is 0.15. in a class of 50 students what is the mean and standard
Test at the 5% level whether the incidence of smoking depends on the age category
How is regression analysis used in forecasting? Provide examples. How may it be used to formulate strategies?
With a selling price of 40 dollars each, how many pool cues must be sold to break even? What would the total revenue be at this break even point?
Test whether there is any change in IQ after the training program (The absolute value of 1 for 4 degrees of freedom at 1% level for one-tailed and two tailed tests are 3.747 and 4.604 respectively)
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