1. If the null hypothesis should be rejected, but it is not, then the researcher
ID: 3320581 • Letter: 1
Question
1. If the null hypothesis should be rejected, but it is not, then the researcher has committed a:
a.Type II error.
b.Type B error.
c.Type A error.
d.Type I error.
2.If the number of trials that it takes rats to learn to navigate a maze is normally distributed, what percentage of rats would have a z score at or above -1.65?
a.4.95%
b.95.05%
c.25.78%
d. 24.22%
3.If you rejected the null hypothesis, you need to consider the possibility that:
a.the study did not have enough power.
b. a Type II error was made.
c. a Type I error was made.
d. the alpha level was too low.
4.In a study of anxiety, the number that represents the scores of 100 participants from that study would be called ___________, and the number that represents the scores of all people who have anxiety would be called ____________.
a. an inferential statistic; a descriptive statistic
b. a descriptive statistic; an inferential statistic
c. a statistic; a parameter
d. a parameter; a statistic
5.In a study, questions on a survey used numbers to represent never (0), rarely (1), sometimes (2), and often (3). In this example, the numbers 0 ,1, 2, and 3 are:
a.interval-level numbers.
b.ordinal-level numbers.
c.ratio-level numbers.
d.nominal-level numbers.
6. Jessica took an final in her General Psychology course and received a score of 60. If the class average was a 70 (s = 10.00), what z score would correspond with Jessica's raw score?
a. 1.00
b. -1.16
c. -1.00
d. 10.00
7. Julie completes a personality test and receives a raw score of 5.00 on agreeableness. If the sample mean was 3.00 with a standard deviation of 1.00, what is Julie's percentile rank?
1.66
84.00
2.00
98.00
8. Knowing that the sampling distribution of a sample mean is normally distributed is handy because:
a.that means one can depend on the central limit theorem.
b. this means that one can calculate an unbiased standard error.
c. the percentage of cases that fall in different parts of a normal distribution is known.
d. the smallest possible sample size can be used.
a.interval-level numbers.
b.ordinal-level numbers.
c.ratio-level numbers.
d.nominal-level numbers.
Explanation / Answer
1)a.Type II error.
2) b.95.05%
3) c. a Type I error was made.
4) c. a statistic; a parameter
5)d.nominal-level numbers.
6) z score =(X-mean)/std deviation=(60-70)/10=-1
c. -1.00
7)Julie's z score =(5-3)/1=2
Julie's percentile rank=98.00
8)
c. the percentage of cases that fall in different parts of a normal distribution is known.
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