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The average waiting time per customer at a fast food restaurant has been 7.5 minutes. The customer waiting time has a normal distribution. The manager claims that the use of a new cashier system will decrease the average customer waiting time in the store. Based on a random sample of 16 customer transactions the mean waiting time is 6.3 minutes and the standard deviation is 2 minutes per customer. Test the manager's claim at 5% and 1% significance level tests.
Compute descriptive statistics for each stock and the S&P 500. Comment on your results. Which stocks are the most volatile? Compute the value of beta for each stock. Which of these stocks would you expect to perform best in an up market? Which..
At the .01 level of signiicance, is the true mean greater than 10?
By constructing null and alternative hypotheses, computing critical values, and comparing test statistic to critical value.
Recognize and describe potential threats (up to 3) to internal validity.
Another day, it took Eric only 12 minutes to get to work. Using the same formula, determine the z value. Is it positive or negative? Explain why it should be positive or negative.
If the amount of cosmic radiation to which a person is exposed while flying by jet across the US is a random variable having the normal distribution with µ=5.35 mrem, and σ = 0.59 mrem.
For such groups of 800, would it be unusual to get 687 consumers who recognize the Dull Computer Company name?
A study group of long distance phone calls made from the corporate offices of Pepsi Bottling Group, Inc., in Somers, New York, revealed the length of the calls, in minutes, follows normal probability distribution.
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
Determine the following:Mean, Median and Variance.
If the sample consists of n = 15 individuals, then compute df value for the t statistic?
Find the probability that the number of who consider themselves basketball fans is :
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