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Tom Sevits is the owner of the Appliance Patch. Recently Tom observed a difference in the dollar value of sales between the men and women he employs as sales associates. A sample of 40 days revealed the men sold a mean of $1,400 worth of appliances per day. For a sample of 50 days, the women sold a mean of $1,500 worth of appliances per day. Assume the population standard deviation for men is $200 and for women $250. At the .05 significance level, can Mr. Sevits conclude that the mean amount sold per day is larger for the women?
(a) State the null hypothesis and the alternate hypothesis.
(b) What is the decision rule?
(c) What is the value of the test statistic?
(d) What is your decision regarding the null hypothesis?
(e) What is the p-value?
(f ) Interpret the result.
A large auto body shop records the odometer readings from its customers. The distribution of miles driven per year of all of their customers has a mean of 14,000 miles and a standard deviation of 4000. If we take an SRS of 12 cars, what is the pro..
In a slow year, Deutsche Burgers will produce 2 million hamburgers at a total cost of $3.5 million. In a good year, it can produce 4 million hamburgers at a total cost of 4.5 million.
Why is this important in testing the effectiveness of the therapeutic lifestyle modification (TLM) program?
The special case of the gamma distribution in which a is a positive integer n is called an Erlang distribution. If we replace b by 1/l in Expression (4.8), the Erlang pdf is
let x be normally distributed random variable with mean u and variance s2 4.84. determine the the size of the sample
Out to right, create a 90% confidence interval estimate of sigma (σ), population standard deviation.
What is the mean weight of my ancient gold coins? How do you consider this collection, a population or a sample? Why? What is the variance (σ2) and standard deviation (σ) in weight of my coin collection? (Remember, depending on whether you consider..
gigi and ron are candidates for mayor in a city. you want to estimate the proportion of gigis voters with 90 confidence
What is the probability that the avearage age of these 40 airplanes is at least 14 years old? Round 4 decimal places. Remeber round ypur z-value to 2 deciimal places.
Find the probability that the sample mean weight of these 400 bags is less than 14.6 ounces?
in their october 2003 issue consumer reports evaluated the price and performance of 23 models of cordless phones.
Let N denote the number of arrivals of a Poisson process of rate λ over the interval (0, T). Given N = n, let S1,..., Sn denote the corresponding arrival times. Prove that
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