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Question: A company hired 20 salespeople and gave them an initial sales skills examination; test scores ranged from 68 to 95, with a mean of 79.4. All salespeople then attended a two-week training program and were re-tested; test scores ranged from 65 to 98, with a mean score of 83.2. The Corporate Training Director asked the Manager of Corporate Research whether the differences in the two test scores was significant, Due to EEO and other regulations, a confidence level of 99% is necessary. What hypothesis test(s) would you suggest to the Manager of Corporate Research?
Compute the test statistic. Using = 0.05, perform the test using either the critical value approach or the p-value approach. What is your conclusion?
Are the residuals from such a regression independent? Is there a difference in model fit and independence of residuals when using infant death rate as a response variable?
The average price of a sample of 12 bottles of diet salad dressing taken from different stores is $1.43. The standard deviation is $0.09. The average price of a sample of 16 low-calorie frozen desserts is $1.03.
Following data on x=weight (in pounds): x 1 33.5, x2 27.3, x3 36.7, x4 30.5 Suppose that one more piece is selected; denote its weight by x5. Find a value of x5 such that X = smaple median.
The frequency distribution below shows the distribution for suspended solid concentration (in PPM) in river water of 50 different waters collected in September 2011.
According to the Internal Revenue Service, the mean tax refund for the year 2007 was $ 2,708. Assume the standard deviation is $ 650 and tha the amounts refunded follow a normal probability distribution.
We want 95% confidence that the sample mean is within $5 of the population mean, and the population standard deviation is known to be $63.
A person is considering purchasing the stock of two home health companies that are similar in all respects except the proportion of earnings paid out as dividends.
The standard deviation of test scores on a certain achievement test is 10.5. A random sample of 150 scores on this test had a mean of 72.8.
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, what percentage of light bulbs have a life less than 2500 hours?
if 30 claims are selected, find the probability that 15 will contain 0 errors, 8 will contain 1 error, 5 will contain two errors and 2 will contain 3 errors.
Find out the probability that temperature of oven will range from 460 to 470 F?
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