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"Overall the students' class attendance days (per year academic) is normally distributed around 180 days with a standard deviation of 15 days.
Students that are in the top 5% will receive a 20% off coupon at the "Crazy" cafeteria. What is the minimum number of attendance days that you should have in order to receive such discount?"
A machine produces 5-inch nails. A sample of 12 nails was selected and their lengths determined. The results are as follows: State the null and alternate hypotheses. Calculate the mean and standard deviation.
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.
A restaurant claims that its speed of service time is less than 18 minutes. A random selection of 36 service times was collected, and their mean was calculated to be 17.1 minutes.
A researcher wants to estimate the average time (in minutes) spent in a car daily. This will be done by randomly surveying 300 individuals and calculating the sample mean.
Concrete blocks are to be used in the foundations of several buildings. The specifications state that the minimum arithmetic mean compressive strength of a sample of blocks must be 1,000 pounds per square inch (psi).
What is the importance of hypothesis testing for independence of variables using two-way tables? Is there an example of this for a better understanding?
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
An automobile assembly line operation has a scheduled mean completion time, mean, of 14.7 minutes. The standard deviation of completion times is 1.2 minutes.
owever, one of the children fails to solve the problem, so the researcher has an undetermined score. What is the best measure of central tendency for these data?
Conduct Chi Square Tests of Significance for the following analysis conducted by a counselor to determine help-seeking behavior across gender and social class of the clients in his clinic. Use the five-step model of hypothesis testing for each ana..
Assuming for a moment that 35% of all Ralph's customers have a discount card, what is the probability of getting a sample proportion at least this big?
Can you conclude that u1 is not equal to u2 at alpha=.05? State the hypothesis in orders of 1-2. construct a 99% confidence interval for the difference in true means. State the confidence interval in terms of 2-1.
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