To use the z test the data _________.
a. must be normally distributed
b. must be sampled from a normal distribution
c. should be sampled from a normal distribution if sample size is 10
d. can be any shape if N = 10
e. should be normal distributed if sample size is 10
If zobt had a value of 4.50 in the direction opposite from that predicted by the directional H1 and zcrit was 2.58, one would _________.
a. accept H0 c. retain H0
b. reject the alternative hypothesis d. reject H0
Assuming that the population mean is 47.2 and the population deviation is 6.4, what is the zobt value for a sample mean of 52.1 if N = 8?
a. 1.96 c. 1.73
b. 2.17 d. 0.77
The critical value of the statistic _________.
a. is independent of alpha
b. is equal to alpha
c. is always the same in the z distribution
d. depends on alpha
The area under the critical region for rejection must _________.
a. equal alpha c. be greater than alpha
b. be less than alpha d. equal one-half of alpha
In cases where N > 1, the relationship between the raw score population standard deviation and the standard error is _________.
a. the standard error is greater than the standard deviation
b. the standard error is less than the standard deviation
c. the standard error equals the standard deviation
d. the standard error is the standard deviation
If one draws all possible samples for various values of N from the same population of raw scores, as N increases _________.
a. the mean of the sampling distribution of the mean increases
b. the mean of the sampling distribution of the mean stays the same
c. the mean of the sampling distribution of the mean decreases
d. none of these
If one draws all possible samples for various values of N from the same population of raw scores, as N increases _________.
a. the standard error of the mean increases
b. the standard error of the mean stays the same
c. the standard error of the mean decreases
d. the standard error of the mean cannot be calculated
A raw score distribution which has a moderate negative skew will result in a sampling distribution of the mean for N = 42 that is _________.
a. also negatively distributed c. positively skewed
b. normally distributed d. cannot be determined
A raw score distribution that is negatively skewed will produce a sampling distribution of the mean for N = 4 which is _________.
a. also negatively skewed c. positively skewed
b. normally distributed d. cannot be determined
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