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A researcher obtained a random sample of n = 60 students to determine whether there were any significant preferences among three leading brands of colas. Each student tasted all three brands and selected his or her favorite. Population data suggests that 50% prefer brand A, 30% prefer Brand B and 20% prefer Brand C. Is there sufficient data to determine that these student data reflect population data? Determine using alpha .05 as critical value.
Take a deck of cards. A deeck has 52 cards with two major colors(Red and Black), with 26 cards each. Red colors comes in two shapes(heart and diamond)
Find the probability that in a given winter month at least 140 cars will be rented. Use the normal distribution to approximate the binomial distribution.
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of 21.1cm.
The administration of Midwest State University wants to know if arrangement of chairs affects student participation in classrooms. What would be a good operational definition of the dependent variable in an experiment designed to measure this rela..
Use empirical Rule to evaluate proportion of costs within 2 standards deviations of mean. Write down these limits.
The accounting department at Weston Materials, Inc., national manufacturer of unattached garages, reports that it takes two construction workers mean of 32 hours and standard deviation of 2 hours to erect the Red Barn model.
Use this sample information to develop a 99% confidence interval for the population proportion of women who wear flats to work.
What is the probability that a randomly selected adult regularly consumes both coffee and soda? What is the probability that a randomly selected adult doesn't regularly consume at least one of these two products?
Set up hypothesis and two-tailed decision rule for right mean using 5% level of significance. Hypothesis for a two-tailed decision is?
Determine the probability of examining a sample mean weight from any 20 women chosen from this population that is less than S (your sample mean) by using population standard deviation?
If and are the proportions of all college males and females correspondingly, who worked last summer, the z statistic (±0.01) for a test comparing the proportions of college men and women who worked last summer is??
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