The confidence interval for the population mean is
tutor4helpyouThe confidence interval for the population mean is ____.
a range of values which probably contains the population mean
a range of values which contains the population mean
the same from sample-to-sample
can only be determined for N less than 20
The df associated with evaluating the significance of robt are ____.
N
N 1
N 2
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Exhibit 13-1
A researcher believes that women today weigh less than in previous years. To investigate this belief, he randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4. A local census taken several years ago shows the mean weight of adult women was 115 lbs.
Refer to Exhibit 13-1. The obtained value of the appropriate statistic for testing H0 is ____.
tobt = 2.07
tobt = +3.07
tobt = 1.32
tobt = +0.32
Refer to Exhibit 13-1. The df for determining tcrit = ____.
41
40
39
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How many t distributions are there?
1
2
30
one for each value of df
If µ = 30, = 5.2, = 28.0, s = 6.1 and N = 13, the value of the most powerful statistic to test the significance of the sample mean is ____.
1.18
1.96
2.18
1.39
"Degrees of freedom" for any statistic is defined as ____.
N
N 1
the number of scores that are free to vary in calculating the statistic
N - 2
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