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A random sample of 40 people who owned their own business reported a yearly mean profit of $10,860 with a standard deviation of $1,448. Find the 92% confidence interval for the population mean. (Round your answers to the nearest dollar)
Draw a box plot for the data in given problem. Are there any outliers? Is the distribution of the data symmetric or skewed? If it is skewed, to what side?
(i) What percent of these bolts will withstand a stress of 90 ksi without breaking? (ii) What range covers the middle 50% of breaking strengths for these bolts?
Estimate the number of homes in the $150,000 up to $200,000 class. About how many homes sold for less than $225,000?
Assume that the standard deviation of such student loan debt is $5,684. Thirty percent of these graduating seniors owe more than what amount?
For college students, is there a relationship between grade point average (GPA) and average number of hours spent studying each week?
ACNielsen is a New York-based corporation and a member of the modern marketing research industry. One of the items that ACNielsen tracks is the expenditure.
a) What is the probability that a randomly chosen impala will have the trait?
Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. What is the lower limit of the 90% confident interval? What is the upper limit of the 90% confident interval?
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Psychologists and psychiatrists do not both prescribe antidepressant drugs.
Why is a z score a standard score? Why can z scores be used to compare scores from different distribution with one another?
Assuming that the mean and standard deviation of the original study hold, what is the probability of obtaining a sample mean of 5.9 miles or less?
What are the four levels of measurement scales? Give examples of each and explain in detail. Explain the use of normal probability plot to evaluate whether a set of data is normally distributed? Please discuss in detail.
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