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A researcher wants to see whether the stress of final exams elevates the blood pressure of freshman women. When they are not under any unusual stress, healthy 18 year olds have a systolic blood pressure that averages mean of 120 mm Hg with a standard deviation of 12mm Hg. If the average blood pressure for 50 women on the final exam day is 125.2, what should I conclude. Significance level =0.01. How do I do this using P-value.
Annual family dental expenses for the families of a random sample of ten employees of a company are given below. You can assume the family dental expenses for the employees of the company are normally distributed.
What is the mean, variance & standard deviation of contract award amount (in millions of dollars)?
In 2004, Newsmonth reported that 60% of young children have blood lead levels that could impair their neurological development. Assuming that a class in a school is a random sample from the population of all children at risk
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability p of success on a single trial.
Suppose the world series is about to begin. Some people get together and each decide to predict different win-loss patterns for the seven possible games during the coming series.
She knows that 60% of the minerals have mass less than a certain amount m, and needs to select a random sample of n = 16 specimens for an experiment. With what probability will their average mass be less than the same amount m? (Hint: Calculate th..
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
A mean score on a standardized test is 50 with a standard deviation of 10. Answer the following
Compute mean and standard deviation for sample of N = 8 females and sample of N = 8 for males.
Use this sample information to develop a 99% confidence interval for the population proportion of women who wear flats to work.
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
Kind of examination produced significant main effects on both mean mark and time taken to complete the examination.
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