FROM INFANCY TO ADULTHOOD: PSY 202 DEVELOPMENTAL
PSYCHOLOGY EXAM"
two-tailed - answers✔✔A student collects data on male (Condition 1) and female (Condition 2)
ratings of social engagement. She is interested in seeing if males have either higher or lower
levels of social enagement than females. What is the appropriate type of hypothesis in this
instance?
a (alpha) - answers✔✔Assuming a true null hypothesis, which of the following is represented by
the shaded region in the graph of the null and alternative distributions? (Critical Value)
If all US adults were to be given the drug, their mean SBP would be less than or equal to 118.5. -
answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of increasing systolic blood pressure of patients using a significance
level of 0.01. Assume SBPs in the population of US adults are distributed normally with a mean
of 118.5 and a standard deviation of 9.0. A sample of 23 US adults treated with the new drug
has a mean SBP of 116.3. Which of these corresponds to the Null Hypothesis?
Type II error - answers✔✔A researcher collected data on extraversion and concluded that
people who underwent an intervention were no more extraverted than people who did not
undergo the intervention. In actuality, however, undergoing the intervention leads to higher
extraversion than not undergoing the intervention. What type of error did they make?
2 - answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of affecting systolic blood pressure of patients using a significance level
of 0.01. Assume SBPs in the population of US adults are distributed normally with a mean of
110.9 and a standard deviation of 10.0. A sample of 15 US adults treated with the new drug has
, a mean SBP of 114.4. If you take a sample of 15 untreated individuals, by how many points
would the sample mean typically be away from 110.9 due to sampling error?
If all US adults were to be given the drug, their mean SBP would be greater than 117.9. -
answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of increasing systolic blood pressure of patients using a significance
level of 0.01. Assume SBPs in the population of US adults are distributed normally with a mean
of 117.9 and a standard deviation of 10.0. A sample of 61 US adults treated with the new drug
has a mean SBP of 115.7. Which of these corresponds to the Alternative Hypothesis?
0 - answers✔✔If you choose an alpha of .10 and want to do a two-tailed test of a mean
difference, what probability will be in each of the critical regions of the null distribution?
H1: μ1 < μ2 - answers✔✔A student is studying perceived social support before an intervention
(Condition 1) and after an intervention (Condition 2). The student predicts that perceived social
support will increase after the intervention. Which of the following is the appropriate one-tailed
alternative hypothesis for this research question?
H₀: ≤ 78 ; H₁: μ > 78 - answers✔✔A student wants to know if her class scored higher than a 78
(with a standard deviation of 1) on a standardized exam. Choose the correct one-tailed null and
alternative hypotheses to address this question.
1 - answers✔✔A teacher wants to know if her class scored better on average than the
population mean of a standardized test. What is the critical value for a one-tailed, one-sample z-
test with an alpha level of .05?
1 - answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of affecting systolic blood pressure of patients using a significance level
of 0.10. Assume SBPs in the population of US adults are distributed normally with a mean of
122.7 and a standard deviation of 7.0. A sample of 26 US adults treated with the new drug has a
mean SBP of 123.7. What is the value of the standard error? Give answer with two decimals.
PSYCHOLOGY EXAM"
two-tailed - answers✔✔A student collects data on male (Condition 1) and female (Condition 2)
ratings of social engagement. She is interested in seeing if males have either higher or lower
levels of social enagement than females. What is the appropriate type of hypothesis in this
instance?
a (alpha) - answers✔✔Assuming a true null hypothesis, which of the following is represented by
the shaded region in the graph of the null and alternative distributions? (Critical Value)
If all US adults were to be given the drug, their mean SBP would be less than or equal to 118.5. -
answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of increasing systolic blood pressure of patients using a significance
level of 0.01. Assume SBPs in the population of US adults are distributed normally with a mean
of 118.5 and a standard deviation of 9.0. A sample of 23 US adults treated with the new drug
has a mean SBP of 116.3. Which of these corresponds to the Null Hypothesis?
Type II error - answers✔✔A researcher collected data on extraversion and concluded that
people who underwent an intervention were no more extraverted than people who did not
undergo the intervention. In actuality, however, undergoing the intervention leads to higher
extraversion than not undergoing the intervention. What type of error did they make?
2 - answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of affecting systolic blood pressure of patients using a significance level
of 0.01. Assume SBPs in the population of US adults are distributed normally with a mean of
110.9 and a standard deviation of 10.0. A sample of 15 US adults treated with the new drug has
, a mean SBP of 114.4. If you take a sample of 15 untreated individuals, by how many points
would the sample mean typically be away from 110.9 due to sampling error?
If all US adults were to be given the drug, their mean SBP would be greater than 117.9. -
answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of increasing systolic blood pressure of patients using a significance
level of 0.01. Assume SBPs in the population of US adults are distributed normally with a mean
of 117.9 and a standard deviation of 10.0. A sample of 61 US adults treated with the new drug
has a mean SBP of 115.7. Which of these corresponds to the Alternative Hypothesis?
0 - answers✔✔If you choose an alpha of .10 and want to do a two-tailed test of a mean
difference, what probability will be in each of the critical regions of the null distribution?
H1: μ1 < μ2 - answers✔✔A student is studying perceived social support before an intervention
(Condition 1) and after an intervention (Condition 2). The student predicts that perceived social
support will increase after the intervention. Which of the following is the appropriate one-tailed
alternative hypothesis for this research question?
H₀: ≤ 78 ; H₁: μ > 78 - answers✔✔A student wants to know if her class scored higher than a 78
(with a standard deviation of 1) on a standardized exam. Choose the correct one-tailed null and
alternative hypotheses to address this question.
1 - answers✔✔A teacher wants to know if her class scored better on average than the
population mean of a standardized test. What is the critical value for a one-tailed, one-sample z-
test with an alpha level of .05?
1 - answers✔✔A pharmaceutical company wants to test whether taking their new anti-anxiety
drug has the side effect of affecting systolic blood pressure of patients using a significance level
of 0.10. Assume SBPs in the population of US adults are distributed normally with a mean of
122.7 and a standard deviation of 7.0. A sample of 26 US adults treated with the new drug has a
mean SBP of 123.7. What is the value of the standard error? Give answer with two decimals.
