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The braking distances (from 60 miles per hour to a complete stop on dry pavement) of a car are normally distributed, with a mean of 136 feet and a standard deviation of 4.66 feet. Random samples of size 15 are drawn from this population, and the mean of each sample is determined. (Adapted from Consumer Reports)
Mean of sampling distribution:
Standard deviation of sampling distribution:
Develop a probability distribution for the number of students in the sample who watch soap operas.
compute the standard error of the estimate for the data below. round to the thousandths place.x 21 22 23 24 25 26y
What are the two main types of probability?- What is an event? What is the union of two events? What is the intersection of two events?
What is the standard deviation of the following data? If necessary, round your answer to two decimal places. 600, 470, 170, 430, 300.
calculate the z-test for sample 100 sample mean 3.4 population mean 3.67 and standard deviation of
a below are the numbers of deaths from tornados in the u.s. from 1990 through 2000.53 39 39 33 69 30 25 67 130 94
Estimate a multiple regression model using revenue as your dependent variable. For independent variables, include population, average income, screens, theatre age, and dummy variables for mall and strip mall.
Suppose that the researcher finds a moderately strong positive correlation. Describe three different possible cause-and-effect explanations for this relationship.
A polling company wants to know how many people over the age of 18 in the United States are unemployed. They take a simple random sample of 500 from the United States to find the percentage.
1. Determine the percentage of aspirin (acetylsalicylic acid) present in aspirin tablets. Can you make any statements about the other materials aside from aspirin that must be in the tablets based upon what you observed in this laboratory ?
Why do the percents not add to 100%? - Make a Pareto chart. What area would you choose as a target for improvement?
The following data give the numbers of orders received for a sample of 30 hours at the Timesaver Mail Order Company.
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