A survey of 25 randomly selected customers found the ages shown (in years). The

Question

A survey of 25 randomly selected customers found the ages shown (in years). The mean is 32.36 years and the standard deviation is 964 years a) How many degrees of freedom does the t-statistic have? b) How many degrees of freedom would the t-statistic have if the sample size had been 225? 41 22 10 36 22 38 22 22 45 29 36 37 25 32 43 35 39 44 44 28 35 30 39 41 14 a) The t-statistic has degrees of freedom (Simplify your answer.) b) If the sample size had been 225, the t-statistic would have degrees of freedom (Simplify your answer.)

Explanation / Answer

1)

a) degree of freeedom =25-1 =24

b) if sample size is 225 ; t statsitic would have 224 degree of freedom

2)

a) std error of mean =std deviation/(n)1/2 =9.45/(25)1/2 =1.89

b) option B old std deviation divided by 4

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