A researcher believes that women today weigh less than in previous years. To investigate this belief, she 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. The df for determining t crit = _________.
A) 41
B) 40
C) 39
D) need more information
Correct Answer:
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Q24: The sample mean is an example of
Q25: For N = 20, the degrees of
Q26: If r = 0.84 and N =
Q27: The 95% confidence interval of the mean
Q28: The mean of the t distribution equals
Q30: How many t distributions are there?
A) 1
B)
Q31: If the population parameters are known, the
Q32: A researcher believes that women today weigh
Q33: A researcher believes that women today weigh
Q34: As N gets _, the critical value
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