(a) mean = standard deviation= (b) mean= standard deviation= (c) Use the results of part (a) and part (b) to make a conjecture about the mean and standard deviation of the z-scores for any set of data.

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(a)

mean =

standard deviation=

(b)

mean=

standard deviation=

(c)

Use the results of part (a) and part (b) to make a conjecture about the mean and standard deviation of the z-scores for any set of data.

(a) Consider the population 3, 4, 9, 14, and 20. The z-scores for each of the five data values are z, * -1.101, z, * -0.944, z, * -0.157, z,4* 0.629, and z20 * 1.573. Find the mean and the
population standard deviation of z3, ZA, Z,, z14, and zao: (Round answers to the nearest whole number.)
mean
standard deviation
(b) Consider the population 2, 6, 12, 17, 22, and 25. The z-scores for each of the six data values are z, * -1.459, zg * -0.973, z,,* -0.243, z,7 * 0.365, z,, * 0.973, and z25 * 1.337. Find the
mean and the population standard deviation of z,, Ze, z,2, z,7, z22, and z25. (Round answers to the nearest whole number.)
mean
standard deviation
(c) Use the results of part (a) and part (b) to make a conjecture about the mean and standard deviation of the z-scores for any set of data.
The mean and standard deviation of z-scores are never the same.
O The mean of the z-scores is always 1 more than the standard deviation.
O The mean of the z-scores is always 1, and their standard deviation is 0.
O The mean of the z-scores is always 0, and their standard deviation is 1.
Transcribed Image Text:(a) Consider the population 3, 4, 9, 14, and 20. The z-scores for each of the five data values are z, * -1.101, z, * -0.944, z, * -0.157, z,4* 0.629, and z20 * 1.573. Find the mean and the population standard deviation of z3, ZA, Z,, z14, and zao: (Round answers to the nearest whole number.) mean standard deviation (b) Consider the population 2, 6, 12, 17, 22, and 25. The z-scores for each of the six data values are z, * -1.459, zg * -0.973, z,,* -0.243, z,7 * 0.365, z,, * 0.973, and z25 * 1.337. Find the mean and the population standard deviation of z,, Ze, z,2, z,7, z22, and z25. (Round answers to the nearest whole number.) mean standard deviation (c) Use the results of part (a) and part (b) to make a conjecture about the mean and standard deviation of the z-scores for any set of data. The mean and standard deviation of z-scores are never the same. O The mean of the z-scores is always 1 more than the standard deviation. O The mean of the z-scores is always 1, and their standard deviation is 0. O The mean of the z-scores is always 0, and their standard deviation is 1.
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