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At a pre-school, teachers have found that, on average, 85% of children will drink milk. In a randomly chosen class of 20 children, what is the probability that at most 16 children will drink milk?
Estimate the mean study time for the population of all students. What is the probability that the sample mean exceeds the population mean by more than 2 hours?
Redheads are rumored to have fiery tempers and you think it might affect their grades. Is there any significant difference in grades between blondes, brunettes and redheads?
Utlizing binomial approximation to normal finding the normal model. A grower claims that only 13 percent of the strawberries he grows are unsatisfactory.
A circus clown at the top of a 60-foot platform is playing catch with another clown on the ground. The clown on the platform drops a ball at the same time as the one on the ground tosses a ball upward at 80 ft/sec.
For a year to be in the upper 5% with respect to the number of fatal crashes, determine how many fatal crashes would have to occur.
Conduct a test to determine whether blood lactate level (y) is linearly related to perceived recovery (x). Use alpha = .05. Find the p-value for testing the hypotheses you gave in the previous problem. Show all decimal places in your answer.
The concentration of glucose(mg/dl) for all samples was measured on one run of a spectrophotometer 1. give the statistical model and full explain each component.
Is the difference in mean scores large enough to be important? (d) Is it reasonable to assume equal variances? (e) Carry out a formal test for equal variances at α = .05, showing all steps clearly.
Assume from past information that it is known that the standard deviation of the population is 9 hours. What is the correct conclusion for this hypothesis test?
a random sample of 100 credit sales in a department store showed an average sale of 120.00. from past data it is known
Operators are to answer telephone calls from customers in an average time of 0.1 minute or less, and either respond to or refer to the proper department within 0.5 minute.
Critically discuss the difference between the standard deviation of the sampling distribution of the mean and the standard deviation of the sampling distribution of the median when we calculate the probability?
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