## PSYC 354 Exam 3

PSYC 354 Exam 3

- The symbol for the standard error is:
- What are the consequences of succeeding in meeting all the assumptions of a parametric test when performing research?
- The mean of a normally distributed population is 75 with a standard deviation of 8. If someone has a z score of ‐1.0, what does this mean?
- Two students recently took algebra class tests. The students are at different schools but wanted to compare their performance. The first student scored 80 on the test. Her class average was 90 with a standard deviation of 10. The second student scored 70. Her class average was 50 with a standard deviation of 10. Which student did better?
- The formula for calculating a z score is:
- When attempting to find a percentage associated with a z score, the second step involves looking up:
- If a distribution of scores has a mean of 90 and a standard deviation of 10, then a score of 70 has a z score that is ________ standard deviation(s) ________ the mean.
- In a standard normal curve, approximately ________% of scores fall within +/‐2 standard deviations from the mean.
- If we wished to compare two scores that are measured on different scales, we would need to transform the scores into:
- Because of the principle of ________, when sample sizes are at least 30, the distribution will most likely resemble a normal distribution.
- The mean for the population is 80 with a standard deviation of 5. Given a z score of 1.45, what is the raw score?
- The phrase statistically significant means that:
- We reject the null hypothesis when the test statistic falls in which area of the distribution?
- On the first statistics exam, the class average was 70 with a standard deviation of 6. You scored 82. What is your z score?
- In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54. Mark studies 16 hours per week. What percent of students study more than Mark?
- Distributions of scores approach the normal distribution as the:
- The statement, “It is hypothesized that men and women will differ on reaction time measures,” best illustrates a:
- Inferential statistical analyses that are not based on a set of assumptions about the underlying population are:
- The mean of the distribution of a set of z scores is:
- Adam scored 70 on his final exam. His class’s average score was 50, with a standard deviation of 10. How many standard deviations is Adam’s score from the mean?
- z scores, raw scores, and percentile ranks are
- The variability in a distribution of scores is ____________ in a distribution of means.
- What is the difference between the denominator of the equation for the z score and that of the z statistic?
- The mean for the population is 67 with a standard deviation of 8.78. Given a z score of 2.56, what is the raw score?
- In a raw score to z score transformation, an associated value on the z table provides the percentage of scores:
- The mean for the population is 224 with a standard deviation of 35. Given a z score of 0.65, what is the raw score?
- A ________ represents the number of standard deviations a particular score is from the mean average.
- Two students from two different schools recently took a science test. The first student correctly answered 34 questions on the test and the second student correctly answered 48 questions. What can you conclude from the two students’ test scores?
- Study Description: Dance Dance Revolution. Unnithan, Houser, and Fernhall (2006. were interested in whether playing the game Dance Dance Revolution (DDR. affected the heart rate of overweight adolescents differently than it affected non‐overweight adolescents. Twenty‐two adolescents, 10 classified as overweight and 12 as not overweight, played DDR for 12 minutes, while the researchers measured each participant’s heart rate. On average, the researchers found no difference between the heart rate of the two groups. Which of the following statements is the null hypothesis for this study?
- The statement “It is hypothesized that children who attend an enrichment program will score higher on IQ tests compared to children who do not attend an enrichment program” best illustrates a:
- In one statistics course, students reported studying an average of 9.92 hours a week, with a standard deviation of 4.54. Mark studies 16 hours per week. What is Mark’s percentile?
- A hypothesis test is said to be ________ when it produces fairly accurate results, even when some of the assumptions underlying the hypothesis test are violated.
- A distribution of means is likely to have ________ compared to a distribution of raw scores.
- Which of the following statements is not an assumption of the z test?
- Compared to the standard 5% cutoff for statistical significance, a cutoff of 1% is:
- If five people obtained scores of 0, 1, 2, 4, and 8 on a test of social conformity, their mean score on the test was
- In statistical formulas, N stands for
- The values of probabilities
- A person rolls a triangular 4‐sided die. The possible numbers that could appear are 1, 2, 3, and 4. What is the probability that a person rolling the die will get a 3?
- If a psychologist observed that four 5‐year‐old children initiated 2, 4, 6, and 12 incidents of aggression during a play period, the mean number of aggressive incidents for this group of four children was