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A restaurant claims that the waiting time of customers for service is normally distributed with a mean of 3 minutes and a standard deviation of 1 minute. The quality assurance dept found in a sample of 50 customers that the mean waiting time was 2.75 minutes. At the .05 significance level, can we conclude that the mean waiting time is less than 3 minutes?
a) State the null hypothesis and the the alternate hypothesis
b) State the decision rule?
c) Compute the value of the test statistic?
d) What is your decision regarding of Ho
e) What is the p-value? Interpret it
Overtime happens after eight hours of work on given day. Determine the probability that letter carrier works overtime on any given day?
Can one conclude at a level of significance of .01 that the new ball has improved his game?
A student with a 3.5 to 4 grade point average who took standardized test is randomly selected. Determine the probability that students test score is less than 36.
A Gallup Poll (June 9 to 12, 2008) interviewed a random sample of 822 adults (18 years or older). The people in the sample were asked about their level of confidence in a variety of institutions in the United States. Here are the results for small..
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
Kind of examination produced significant main effects on both mean mark and time taken to complete the examination.
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
What does the binomial distribution chart look like? Can I use Excel to come up with this chart?
Oxytocin is a naturally occurring brain chemical that is nicknamed the "love hormone" because it seems to play a role in the formation of social relationships such as mating pairs and child-parent bonding.
Replacement times for new Ford Taurus GL automobiles are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years.
For following two regressions describe and interpret major parts from regression output. write down the difference between two regressions?
(a) Compute the arithmetic mean of the subscribers' incomes. (b) Compute the modal and median incomes.
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