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From several yars of sales records, store management has determined that a week demand for some items has a normal distribution with the mean of 563 units, and the standard deviation of 112 units.. What is the probability that the demand for this item in the upcoming week will be between 600 and 700 units.
What is the probability of obtaining 4 ones in a row when rolling a fair, six-sided die? Interpret this probability.
Here are heart rates for a sample of 30 students before and after a class break. At alpha =.05, was there a significant diffeence in the mean heart rate?
For the following data set, indicate whether the shape of the distribution is normal, positively skewed, or negatively skewed. Provide evidence for your answer by calculating the mean, mode, and median.
Use the 5% level of significance. (a) Define null and alternate hypotheses. (b) Determine the value of sample test statistic? (c) Determine(or estimate) P-value.
A national Retail Foundation survey found housholds intended to spend an average of $932 during the December holiday season. Assume that the survey included 850 households and that the standard deviation of the sample is $215.
A sample of 30 cookies is taken to test the claim that each cookie contains at least 9 chocolate chips. The average number of chocolate chips per cookie in the sample was 7.8 with a standard deviation of 3.
What is given is the mean=27.2 kilograms and standard deviation=4.3 kilograms. I attempted to work out a which I know is wrong but this is what I did.
Develop the opportunitiy loss table and compute the expected opportunity loss for each product. Determine how much the firm would be willing to pay to a market research firm to gain better information about future market conditions.
I have been approached by a pharmaceutical company that has developed a new drug, which is supposed to be effective in the treatment of schizophrenia.
Determine the probability, P(Z
A researcher wants to create a 99% confidence interval for the population mean. He has a sample of n=120, an x-bar of $340, and a sample standard deviation of $122. What is the margin of error?
Determine probability of 0 nonconforming units on first sample and 2 nonconforming units on second? First gasket selected is returned to lot before the second one is selected.
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