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A manufacturer of headache medicine claims it is 70% effective within a few minutes. That is, out of every 100 users, 70 get relief quickly. A group of 12 patients are given the medicine. If the claim is true, what is the probability that 8 have relief in a few minutes?
a. 0.001b. 0.168c. 0.667d. 0.231e. None of the above
With a Rejection Region of 8, 9 or 10, what is the probability of a Type II error, if the job applicant has a probability of identifying the odd sample with p = 0.5?
Suppose a researcher has trained observers to rank participants according to their level of frustration when trying to solve a puzzle.
What sample size is needed to estimate with 95 persent confidence the mean intake of calcium within 20 units of the true mean if the intake is normal with a variance of 1900 units?
Suppose observations on 50 vehicles yielded a sample mean of 65 mph. Assume that the standard deviation of vehicle speed is known to be 6 mph. Determine the two-sided 99% confidence intervals of the mean speed.
Do hotel managers on the average differ significantly in femininity score from men in general? Assume that the standard deviation of scores in the population of all male hotel managers is the same.
The ages of cars owned by all employees of a large company have a bell shaped distribution with a mean of 8 years and a standard deviation of 2 years. Using the empirical rule, find the approx. percentage of cars (owned by those employees) that are b..
Set up hypotheses and test to find out whether or not population variance is larger than $100.
Lashing together logs of diameter .30m and length 1.8m. How many logs will be needed to keep them afloat in fresh water. take the density of the logs to be 800kg/m^3.
First National Bank and City National Bank are competing for customers who would like to open IRAs. 32 weeks are randomly selected for First National Bank and another 32 weeks are randomly selected for City National.
A standard deviation of .15 million people. What is the proportion of these newscasts having between .9 million and 1.5 million viewers?
The grouped frequency distribution below summarizes the results. Based on the grouped frequency distribution, you are to identify the mean and median for waiting times.
The life span of a battery is normally distributed, with a mean of 2500 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2590 hours?
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