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davenport stat500 week 4 quiz ch 6 and 7




Question;?;If selecting samples of size n = 10 from a;population with a known mean and standard;deviation, what requirement, if any, must be satisfied in order to assume;that the;distribution of the sample means is a normal distribution?;?;Question 2;5 out of 5 points;If z is a standard normal variable, find the;probability.;The probability that z lies between 0.7 and 1.98.;?;Question 3;5 out of 5 points;For a standard normal distribution, find the;percentage of data that are more than 1;standard deviation away from the mean.;?;Question 4;0 out of 5 points;Solve the problem. Round to the nearest tenth;unless indicated otherwise.;Scores on an English test are normally distributed with a mean of 33.8 and a;standard;deviation of 8.5. Find the score that separates the top 59% from the bottom;41%.;?;Question 5;5 out of 5 points;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?;?;Question 6;5 out of 5 points;In one region, the September 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. If 50;different homes are randomly selected, find the probability that their mean;energy;consumption level for September is greater than 1075 kWh.;?;Question 7;5 out of 5 points;True of False.;The central limit theorem states that as the sample size increases, the;distribution of sample means approaches a skewed distribution.;?;Question 8;5 out of 5 points;Solve the problem.;The following confidence interval is obtained for a population proportion, p;0.883


Paper#62376 | Written in 18-Jul-2015

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