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davenport stat500 week 4 quiz ch 6 and 7

Question # 00008254
Subject: Statistics
Due on: 03/20/2014
Posted On: 02/10/2014 04:36 PM

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·

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<p<0.911. Use these confidence interval limits to find the margin of error, E.

· Question 9

5 out of 5 points

Use the confidence level and sample data to find a confidence interval for estimating the population ?. Round your answer to the same number of decimal places as the sample mean.

Test scores: n = 105; mean x = 70.5; ? = 6.8; 99% confidence

· Question 10

5 out of 5 points

True of False.

If, under a given assumption, the probability of a particular observed event is exceptionally small (such as less than 0.05), we conclude that the assumption is probably not correct.

· Question 11

5 out of 5 points

Use the given data to find the minimum sample size required to estimate the population proportion.

Margin of error: 0.003, confidence level: 94%, p and q unknown

· Question 12

5 out of 5 points

Use the given information to find the minimum sample size required to estimate an unknown population mean ?.

How many business students must be randomly selected to estimate the mean monthly earnings of business students at one college? We want 95% confidence that the sample mean is within $129 of the population mean, and the population standard deviation is known to be $595.

Tags quiz week stat500 davenport mean points question sample standard confidence population deviation distribution probability size given distributed data inches level interval estimate normal normally error test true false selected aumption greater randomly

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davenport stat500 week 4 quiz ch 6 and 7

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Tutorial Preview …points xx one xxxxxxx the September xxxxxxxxxxx levels for xxxxxxxxxxxxx homes xxx xxxxx to xx normally distributed xxxx a mean xx 1050 xxx xxx a xxxxxxxx deviation of xxx kWh If xx different xxxxx xxx randomly xxxxxxxxx find the xxxxxxxxxxx that their xxxx energy xxxxxxxxxxx xxxxx for xxxxxxxxx is greater xxxx 1075 kWh xxxxxxx Answer: x xxxx · xxxxxxxx 7 5 xxx of 5 xxxxxx True xx xxxxx The xxxxxxx limit theorem xxxxxx that as xxx sample xxxx xxxxxxxxxx the xxxxxxxxxxxx of sample xxxxx approaches a xxxxxx distribution xxxxxxx xxxxxxx False xx Question 8 x out of x points xxxxx xxx problem xxx following confidence xxxxxxxx is obtained xxx a xxxxxxxxxx xxxxxxxxxxx p:…
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Preview: mean xxxxxxx Answer: 31 xxxxxxxxxxx 40 out xx 5 pointsSolve xxx problem xxxxx xx the xxxxxxx tenth unless xxxxxxxxx otherwise Scores xx an xxxxxxx xxxx are xxxxxxxx distributed with x mean of xx 8 xxx x standard deviation xx 8 5 xxxx the score xxxx separates xxx xxx 59% xxxx the bottom xxx Correct Answer: 31 xxxxxxxxx 55 xxx xx 5 xxxxxxxxx diameters of xxxxx produced by x certain xxxxxxx xxx normally xxxxxxxxxxx with a xxxx of 0 xx inches xxx x standard xxxxxxxxx of 0 xx inches What xxxxxxxxxx of xxxxx xxxxxxxxxx a xxxxxxxx greater than x 32 inches?Correct xxxxxxxxxx 28%Question xx xxx of x pointsIn one xxxxxxx.....
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