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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.
The booster club has gotten several businesses and car dealers to donate gasoline and cars for the college students to use to make a maximum of 575 personal contacts daily during the fund-raising drive. The college student will donate a total of 2..
Using the .05 level of significance: a) Is there a difference among types of gasoline? b) Is there a difference in the cars?
If is the proportion of the next 100 shoppers that buy a packet of the crackers after tasting a free sample, then the probability that fewer than 30% buy a packet after tasting a free sample is approximately.
What does null hypothesis for repeated-measures hypothesis test state?
Define the decision rule. Calculate the value of the test statistic.
He randomly samples 45 oil wells throughout the United States and determines the mean output to be 10.7 barrels per day with a standard deviation of 1.3 barrels. Test the researcher's claim at the .025 level of significance.
A random variable X is normally distributed with mu = 60 and standard XXX = 11. What is zscore for X = 71
Compute the probability that randomly chosen student with a Master's degree majored in English or mathematics?
Which of the following models are appropriate to forecast a time series whose amplitude increases over time?
State the hypotheses for a right-tailed test.
Find out a 95 percent confidence interval for population mean.
The level of significance indicates the probability of rejecting a false null hypothesis.
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