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Chap6Stats - Review Assessment Test Chapter 6 User...

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Review Assessment: Test Chapter 6 User Elizabeth S Knowles Submitted 3/18/08 6:24 PM Name Test Chapter 6 Status Completed Score 68 out of 80 points Time Elapsed 2 hours, 9 minutes, and 47 seconds out of 3 hours and 0 minutes allowed. Instructions Question 1 2 out of 2 points Solve the problem. In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kWh and a standard deviation of 218 kWh. Find P 45 , which is the consumption level separating the bottom 45% from the top 55%. Selected Answer: 1021.7 Correct Answer: 1021.7 Question 2 0 out of 2 points Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution. Find the probability of the given range of pounds lost. More than 9 pounds Selected Answer: Correct Answer: Question 3 2 out of 2 points If Z is a standard normal variable, find the probability. The probability that Z lies between -2.41 and 0 Selected Answer: 0.4920 Correct Answer: 0.4920 Question 4 0 out of 2 points
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Solve the problem. The scores on a certain test are normally distributed with a mean score of 51 and a standard deviation of 2. What is the probability that a sample of 90 students will have a mean score of at least 51.2108? Selected Answer: 0.3413 Correct Answer: 0.1587 Question 5 2 out of 2 points Use the continuity correction and describe the region of the normal curve that corresponds to the indicated binomial probability. The probability of more than 56 correct answers Selected Answer: The area to the right of 56.5 Correct Answer: The area to the right of 56.5 Question 6 2 out of 2 points Identify the probability of each sample, and describe the sampling distribution of the sample means. Personal phone calls received in the last three days by a new employee were 2, 6, and 8. Assume that samples of size 2 are randomly selected with replacement from this population of three values. Selected Answer: 1/9; 1/9; 1/9; 1/9; 1/9; 1/9; 1/9; 1/9; 1/9 Correct Answer: 1/9; 1/9; 1/9; 1/9; 1/9; 1/9; 1/9; 1/9; 1/9 Question 7 2 out of 2 points Find the indicated probability. The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than 0.32 inches? Selected Answer: 2.28% Correct Answer: 2.28% Question 8 0 out of 2 points Solve the problem. The amount of snowfall falling in a certain mountain range is normally distributed with a mean of and a standard deviation of What is the probability that the mean annual snowfall during 36 randomly picked years will exceed
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Selected Answer: 0.4192 Correct Answer: 0.0808 Question 9 2 out of 2 points Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
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