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The amount of time spent watching television or playing video games is considered a significant factor on predicting childhood obesity. 290 parents of school-aged children were asked to estimate the
The mean annual cost of automobile insurance is $939 (CNBC, 2/23/2006), with a standard deviation of $245. What is the probability that the annual cost of auto insurance for a single individual will b
A glass factory produces windshields for large commercial trucks. Assume that the process that produces the windshields can be described by a Poisson distribution with an average of 4.8 defects per
Classify as categorical or quantitative data. Your statistics teacher has gathered information on each of the students in your class in order to illustrate the difference between categorical and qu
According to a recent survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sam
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 18 hours, with a standard deviation of
The number of customers arriving at the checkout counter in a department store during a one hour period is a Poisson random variable with parameter ? = 7. What is the probability of:
How many defective lamps would you expect to find in a box of 14 lamps? What is the standard deviation of the number of defective lamps in this box?
Another archer is shooting 4 arrows at a target. In each shot, his probability of hitting the target equals p . The probability that he will miss all four shots equals 0.197530864. What is the value
The number of traffic accidents in a town in 10 randomly chosen rainy days in 2012 is as follows: {4, 0, 6, 5, 2, 1, 2, 0, 4, 3). Use these data to estimate the proportion of rainy days in this town
What does it mean to say there is error in our regression?
Given that Sxx = 265, Syy = 172, and Sxy = 184, what is the value of the linear correlation coefficient?
Recent information published by the U.S. Environmental Protection Agency indicates that Honda is the manufacturer of five of the top ten vehicles in terms of fuel economy. Determine the probability
An insurance company estimates 45 percent of its claims have errors. The insurance company wants to estimate with 95 percent confidence the proportion of claims with errors. What sample size is nee
For a given multiple regression model with three independent variables, the value of the adjusted multiple coefficient of determination is _________ less than R2.
It is found that on average each person who regularly visits the bar spends about $2500 per year in the bar with a standard deviation of $450. Construct a 99 percent confidence interval around the
A person has applied for positions at Company A, Company B and Company C. The probability of obtaining an offer from Company A is 0.4, from B is 0.3 and from C is 0.6. Assume that the three jobs of
The researcher wants to know if there is sufficient evidence to conclude that the proportion of adults who support the death penalty is higher in the U.S.A. than in Germany. What is the decision at
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 10% of the products to weigh mo
The fill volume of an automated filling machine used for filling cans of carbonated beverage is normally distributed with a mean of 12.2 fluid ounces and a standard deviation of 0.1 fluid ounce.
The Arizona Department of Transportation wishes to survey state residents to determine what proportion of the population would like to increase statewide highway speed to 75 from 65 mph. At least ho
Cooking oils that are low in both cholesterol and saturated fats are often recommended for people who are trying to lower their blood pressure or to lose weight. Many cooking oils that have no chole
Calculate a 99% two-sided confidence interval on the proportion of such tears that will heal. Round the answers to 3 decimal places. Calculate a 99% lower confidence bound on the proportion of such
A city council consists of 7 males and 4 females. Two councilors are selected at random to represent the city. What is the probability that
In a test of hypotheses, a researcher used the level of significance a = .05. Based on a random sample, she obtained a P-value of 0.052. Which of the following is true?