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The Tampa Bay (FLA) Area Chamber of Commerce wanted to know whether the mean weekly salary of nurses was larger than that of school teachers. It is believed that the historic variances of each group's weekly salary are not the same. To investigate, they collected salary information on the amounts earned last week by a sample of school teachers and nurses. The data can be found on our Excel worksheet.
Is it reasonable to conclude that the mean weekly salary of school teachers is lower at a .05 level of significance? Why?
Are the two groups significantly different at a .05 level of significance? Explain how you arrived at this conclusion.
Finds that their mean travel time is = 22.5 minutes. What are the null and alternative hypotheses for testing whether the true mean is different from 20 minutes?
Which of the following models satisfies the rules of probability and The event corresponding to the above system functioning properly during one period of operation is
A person claims to have ESP (extrasensory perception). A coin is tossed 16 times, and each time the person is asked to predict in advance whether the coin will land heads or tails.
1st a confidence interval is constructed without utilizing the finite population correction factor.
Psychologists once measured 77 variables on a sample of schizophrenic people and a sample of people who were not schizophrenic. They compared the two samples using 77 separate significance tests.
Suppose that 30% of all adults in Ohio support the increase. The probability that at least 800 people support the increase is?
What sample size must you take to be 96% confident that the results will be within $.75 of the true mean cost per call?
Determine a random number generator and make simulated data for not more than 25 participants (test subjects) in study using ranges of values for variables you established above.
Support casinos in the sample? B) calculate a 95% confidence interval to estimate the population proportion of all residents who wupport casinos.
Determine the median, and the standard deviation. Determine the coefficient of skewness using Pearson's method. Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch, Inc.
A researcher conducts some research in which they identify a significant positive correlation (r =0.42) between the number of children a person has and their life satisfaction. Which of the following is it inappropriate to conclude from this resea..
Of those mountain climbers who attempt mt. McKinley, only 60% reach the summit. In a random sample of 14 mountain climbers who are going to attempt mt. McKinley, what is the probability of each of the following?
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