Statistics 1A - RUG - Psychology - B1 - Practice exam 2018/2019

Questions - Question 1 to 10

Question 1

If Z is standard normally distributed, what is the value of z for which P(Z>z)=0.05?

1. -0.5199
2. 0.5199
3. 1.96
4. 1.645

Question 2

The table below contains 10 scores on a variable. There is one clear outlier, displayed in the table in blue. What happens if we were to remove this outlier?

1. The mean will increase, but the median will stay the same
2. The median will increase, but the mean will stay the same
3. The mean and the median will increase
4. The mean and the median will stay the same

Question 3

The diagram below represents a density curve of variable X.

Which of the statements below is correct?

1. The mode of X is equal to zero
2. The distribution of X is skewed to the left
3. The mean and the median of X seem to be equal
4. The distribution of X is a unimodal distribution

Question 4

Belgium has two official languages: French and Dutch. Suppose 60% of the Belgian population speaks Dutch and 40% speaks French. Event A is the event that two randomly selected people from Belgium speak the same language. What is the complement of event A?

1. 0.52
2. 0.48
3. {Dutch, French}
4. {(Dutch, French), (French, Dutch)}

Question 5

Which statement below about voluntary response sample is correct?

1. Voluntary response samples are not susceptible to bias
2. A voluntary response sample contains people that have volunteered to take part in the study
3. Both A and B are correct
4. Neither A and B are correct

Question 6

Grades on the statistics 1A exam are notmally distributed with a mean of 5.5 and a standard deviation of 2. Which percentage of students has scored higher than 9.5 on the exam?

1. 2.5%
2. 5.0%
3. 95%
4. 97.5%

Question 7

In a given population the preparation time for an exam is normally distributed with μ = 115 hours and σ = 3 hours. What percentage of people from this population has a preparation time between 115 and 120 hours?

1. Approximately 45%
2. Approximately 50%
3. Approximately 55%
4. Approximately 95%

Question 8

A researcher would like to predict for both men and women the occurences of obsessive compulsive behavior from their score on an obsessive compulsive test. In this study the independent variable is...

1. Occurences of obsessive compulsive behavior
2. Sex
3. Probability of compulsive behavior
4. Score on the obsessive compulsive test

Question 9

A radnom sample size of n is dawn from a population with a mean μ and a standard deviation σ. The sample mean of all observations in the sample x̄ is determined. Which of the statements below about the sample mean x̄ is correct?

1. The standard deviation of x̄ will get smaller if the sample size n gets larger
2. The variance of x̄ is equal to (σ²/n)
3. The mean of x̄ is equal to the population mean μ
4. All the statements above are correct

Answers - Question 1 to 10

Question 1

D

Question 2

A

Question 3

C

Question 4

D

Question 5

B

Question 6

A

Question 7

A

Question 8

D

Question 9

D

Question 10

D

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