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How much time do Americans spend eating or drinking? Suppose for a random sample of 1001 Americans age 15 or older, the mean amount of time spent eating or drinking per day is 1.22 hours with a standard deviation of 0.65 hours?
a) A histogram of time spent eating & drinking each day is skewed right. Use this result to explain why a large sample size is needed to construct a confidence interval for the mean time spent eating & drinking each day.
b) In 2010, there were over 200 million Americans age 15 or older. Explain why this, along with the fact that the data were obtained using a random sample, satisfies the requirements for constructing a confidence interval.
c) Determine and interpret a 95% confidence interval for the mean amount of time Americans age 15 or older spend eating & drinking each day.
At the .01 significance level, is there a relationship between job pressure and age?
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Test out an suitable hypothesis also state your conclusion. Make sure the suitable assumption as well as conditions are satisfied before you proceed.
Florida State University administers a test of mathematics placement to students when they first enter the university.
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A random variable X is normally distributed with mu = 60 and standard XXX = 11. What is zscore for X = 71
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A supervisor has noticed that sales for all departments world wide has been averaging $12,000 a month for a number of years. For the last 18 review periods the average sales figure has dropped to $11,500 with a standard deviation of $4,000. Manage..
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The one-sample t statistic has the value t = -1.68. What do we know about the P -value of this test?
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