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Car accidents in parking lots are quite common in this and in many other states. Assume from a random sample of 25 days in the state of Texas, it was found that the number of daily car accidents in parking lots was found to have a mean of 123.8 and a standard deviation of 5.2. Based on this information, find a 95% confidence interval regarding the standard deviation for the number of daily cars accidents in parking lots in the state of Texas. Assume the sample came from a normally distributed population. Round final results to the nearest tenth.
Consider a set of n independenttrials in which there are r possible outcomes s1,...,sr for each trial. In each trial, P[si] = pi. Let Ni equal the number of times that outcome si occurs over n trials. What is the joint PMF of N1,..., Nr?
Create a 95% confidence interval for the difference in rate of return for the 3- and 5-year periods covered by these data. Clearly explain what your interval means.
A researcher administers a treatment to a sample of n = 25 participants and uses a hypothesis test to evaluate the effect of the treatment.
A random sample of 160 car crashes are selected and categorized by age. The are listed below. The age distribution of for the given categories is 18% for under 26, 39% for 26-45, 31% for 46-65, and 12% for over 65.
Construct a stem-and leaf display for the data set? Construct a box plot for the data set? Draw conclusions about the data (e.g. are there any outliers, etc, etc.).
A particular bulb is turned on once each evening for an average of 10 hr. If it is desired to have a reliability of 90 percent, what is its design life in days?
Level annual equivalence principle premiums are payable prior to failure.S how that for any nonnegative integer r, Var(rL) = 1/15.
The life span of a battery is normally distributed, with a mean of 2500 hours and a standard deviation of 50 hours. What percent of batteries have a life span that is more than 2590 hours?
The following data resulted from a taste test of two different chocolate bars. The first number is a rating of the taste, which could range from 0 to 5, with a 5 indicating the person liked the taste.
Compute the mean estimate for Jocko and the mean estimate for the other garage. Report the difference in the means and the 95% confidence interval.
Compute the z-score corresponding to each of the following values of x: What is the 50th percentile of a quantitative data set called?
An economist investigated the association between a country's Literacy Rate and Gross Domestic Product (GDP) and used the association to draw the following conclusions. Explain why each statement is incorrect. (Assume that all the calculations wer..
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