What percent of the data will fall within four standard deviations of the mean for any distribution?
1.At least 75
2.At least 68
3.At least 89
4.At least 93.75
Q. 2Below is a box-and-whiskers display of GPAs of statistics students.
Estimate the interquartile range from the display.
1.0.8
2.2.7
3.3.5
4.Over 2
Q. 3A test score was converted into a standard score. What does a z-score of zero indicate about the test score?
1.a poor test score relative to the class
2.a very good test score relative to the class
3.an average test score for the class
4.Nothing can be said about the performance without knowing the mean.
Q. 4The 5-Number Summary includes all of the following except?
1.the maximum
2.the minimum
3.the median
4.the mode
5.the third quartile
Q. 5In order to describe the position a specific data value possesses in relation to the rest of the data all but which can be used?
1.mode
2.percentiles
3.z-scores
4.quartiles
Q. 6Starting with a data value of 100, find three other numbers such that the sample standard deviation is less than 5.
1.5, 10, 14
2.101, 100, 105
3.105, 110, 114
4.95, 110, 110
Q. 7Consider that data set 24, 37, 34, 45, 52, 27. Calculate the sample standard deviation using a graphing calculator.
1.10.6
2.9.7
3.36.5
4.113.1
Q. 8What does a standard deviation of 0 mean?
1.The mean is very low.
2.The data values are all very close in value.
3.The data values must all be the same.
4.All the data values must be 0.