Deck 1: Why Is My Evil Lecturer Forcing Me to Learn Statistic

Question 1

Which of the following is true about a 95% confidence interval of the mean for a sample of grocery shoppers rating their favourite store?

A) 95 out of 100 sample means will fall within the limits of the confidence interval.
B) There is a 95% chance that the population mean will fall within the limits of the confidence interval.
C) 95 out of 100 population means will fall within the limits of the confidence interval.
D) There is a .05 probability that the population mean falls within the limits of the confidence interval

Answer 1

There is a 95% chance that the population mean will fall within the limits of the confidence interval.

Question 2

What is a significance level?

A) The level at which statistics finally become meaningful
B) The impact that reporting statistics incorrectly could have.
C) A pre-set level of probability what the results are correct
D) A pre-set level of probability at which it will be accepted that results are due to chance (or not).

Answer 2

A pre-set level of probability at which it will be accepted that results are due to chance (or not).

Question 3

A null hypothesis.

A) States that the experimental treatment will have an effect.
B) Is rarely used in experiments.
C) Predicts that an experimental treatment will have no effect on a dependent variable of interest.
D) None of the above.

Answer 3

Predicts that an experimental treatment will have no effect on a dependent variable of interest.

Question 4

What is the conventional level of probability that is often accepted when conducting statistical tests in social science and business?

A) 0.1
B) 0.05
C) 0.5
D) 0.001

Question 5

If we calculated that the correlation (i.e. the effect size) of company size and sales revenue for various organizations was r = .42, which expression would best describe this relationship?

A) Small
B) Small to medium
C) Large
D) Medium to large

Question 6

The standard deviation is the square root of?

A) The coefficient of determination
B) Sum of squares
C) Variance
D) Range

Question 7

A Type I error is when?

A) We conclude that there is a meaningful effect in the population when in fact there is not.
B) We conclude that there is not a meaningful effect in the population when in fact there is.
C) We conclude that the test statistic is significant when in fact it is not.
D) The data we have typed into SPSS is different than the data collected.

Question 8

What does a significant test statistic tell us?

A) There is an important effect.
B) The hull hypothesis is false.
C) There is an effect in the population of sufficient magnitude to be scientifically interesting.
D) All of the above,

Question 9

If research suggests that the mean number of insurance quotations a person makes in a year is 26 with a standard deviation of 4, what is the z-score for a score of 18?

A) -2
B) 11
C) 2
D) -1.41

Question 10

The aim of experimental research is to?

A) Be a phenomenon
B) Cause a phenomenon
C) Investigate what caused a phenomenon
D) Prevent a phenomenon

Question 11

Which of the following terms best describes the sentence: 'organizations with employee training programmes will not employ fewer men or women'.

A) A directional hypothesis
B) An operational definition
C) A null hypothesis
D) A non-directional hypothesis

Question 12

'Reducing the advertising budget will reduce short-term sales performance'. State the direction of this hypothesis.

A) Directional
B) Non-directional
C) Both
D) Not enough information given.

Question 13

Which of these statements about statistical power is not true?

A) Power is the ability of a test to detect an effect.
B) We can use power to determine how big a sample is required to detect an effect of a certain size.
C) Power is linked to the probability of making a Type I error.
D) All of the above are true.

Question 14

Which of these statements is correct about one- and two-tailed tests?

A) A statistical model that tests a directional hypothesis is called a one-tailed test, whereas one testing a non-directional hypothesis is called a two-tailed test
B) A statistical model that tests a non-directional hypothesis is called a one-tailed test, whereas one testing a directional hypothesis is called a two-tailed test.
C) A two-tailed test is a more powerful test than a one-tailed test.
D) A one-tailed test is a more accurate test than a two-tailed test.

Question 15

A frequency distribution in which low scores are most frequent (i.e. bars on the graph are highest on the left-hand side) is said to be.?

A) Positively skewed
B) Leptokurtic
C) Platykurtic
D) Negatively skewed