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QUESTION:
1
[QUESTION
BANK ID:
307173]
CORRECT
When using a one-tailed test and a sample size of 24, what is the probability of a value being to the left of a
number that has a student-t statistic of –2.50?
TYPE:
MULTIPLE CHOICE

B
2%

Explanation:
The t-distribution is symmetric, so looking up something for the probability of a value being to the left of –x.xx
is the same as looking up the probability of a value being to the right of x.xx. Since the sample size is 24, the
df are 23. Reading across the row for df 23 we see that 2.500 is in the column for alpha = 0.01. Since this is a
one-tailed test all of alpha is in the one tail, and that makes the probability 1%.
C
1%
Explanation:
The t-distribution is symmetric, so looking up something for the probability of a value being to the left of –x.xx
is the same as looking up the probability of a value being to the right of x.xx. Since the sample size is 24, the
df are 23. Reading across the row for df 23 we see that 2.500 is in the column for alpha = 0.01. Since this is a
one-tailed test all of alpha is in the one tail, and that makes the probability 1%.
D
0.5%
Explanation:
The t-distribution is symmetric, so looking up something for the probability of a value being to the left of –x.xx
is the same as looking up the probability of a value being to the right of x.xx. Since the sample size is 24, the
df are 23. Reading across the row for df 23 we see that 2.500 is in the column for alpha = 0.01. Since this is a
one-tailed test all of alpha is in the one tail, and that makes the probability 1%.
QUESTION:
2
[QUESTION
BANK ID:
307226]
CORRECT
The process of calculating the chi-square test statistic includes squaring the differences between which two
values?
TYPE:
MULTIPLE CHOICE

Explanation:
The chi-square statistic is the sum of all the squares of the differences between the observed and expected
values for each cell.
C
The continuous and the discrete values
Explanation:
The chi-square statistic is the sum of all the squares of the differences between the observed and expected
values for each cell.
D
The sample mean and the population mean
Explanation: