Question

1-

There are 9 students in a class and 1 is female. If she is selected as class president, which of the following completes a TRUE sentence? We can reject the null hypothesis of no bias in favour of the female student

Select one:

a. at α = 0.05.

b. at α = 0.01.

c.

at α = 0.15.

d. at α = 0.10.

2-

Pipefish are present in low numbers in the seagrass beds of Akaroa Harbour. You have data on the number of pipefish caught in a seagrass bed. Which probability distribution is most likely to be the underlying distribution of the population?

Select one:

a. Normal

b. Poisson

c. Uniform

d. Binomial

3-

Which of the following is NOT a possible value of the correlation coefficient?

Select one:

a. 1.77

b. +1.00

c. -1.00

d. 0.123

4-

You have run a Wilcoxon Rank-Sum test on reaction times in two groups of students in R and get the following output. Using the usual alpha = 0.05, which of the following is true?

> wilcox.test(males,females) Wilcoxon rank sum test data: males and females W = 1691, p-value < 2.2e-16 alternative hypothesis: true location shift is not equal to 0

Select one:

a. The number of samples was 1691.

b. The two groups differ significantly in their mean reaction times.

c.

The data must have been non-normal.

d. The two groups differ significantly in their mean ranks.

Answer #1

A math class consists of 25 students, 14 female and 11 males.
Three students are selected at random to participate in a
probability experiment. Compute the probability that
a male is selected, then two females.
a female is selected, then two males.
two females are selected, then one male.
three males are selected.
three females are selected.

A class of 40 students, 18 are males and 22 are females.
For the final examination, 3 males and 5 females achieved a letter
grade of A. What is the probability that a randomly selected
student from the class achieved letter A grade or is a male
student?
Select one:
a. 27/40
b. 22/40
c. 25/40
d. 30/40
e. 13/30

The mean number of English courses taken in a two–year time
period by male and female college students is believed to be about
the same. An experiment is conducted and data are collected from 25
males and 13 females. The males took an average of 4 English
courses with a standard deviation of 0.8. The females took an
average of 2.5 English courses with a standard deviation of
1.0.
Set up a hypothesis test to determine whether this difference is...

A pharmacist wants to compare a health outcome among three
treatment groups. The health outcome data is ordinal (Likert)
scale. Which of following methods is the best choice?
A. Kruskal-Wallis Analysis
B. One-way ANOVA
C. t-Test
D. Wilcoxon rank sum test

You wish to test the hypothesis that female college students
spend more on wearing apparel than male college students. Which of
the following is INCORRECT?
The null and alternate hypotheses are:
Ho : mF < = mM
HA : mF > mM
If you concluded that female students spend more than male
students when in fact there is no difference between the two
groups, you would be committing a Type II error.
If we conclude that females spend less than...

Do male college students spend more time than female college
students using a computer? This was one of the questions
investigated by the authors of an article. Each student in a random
sample of 46 male students at a university in England and each
student in a random sample of 38 female students from the same
university kept a diary of how he or she spent time over a
three-week period.
For the sample of males, the mean time spent...

Do male college students spend more time than female college
students using a computer? This was one of the questions
investigated by the authors of an article. Each student in a random
sample of 46 male students at a university in England and each
student in a random sample of 38 female students from the same
university kept a diary of how he or she spent time over a
three-week period.
For the sample of males, the mean time spent...

Do male college students spend more time than female college
students using a computer? This was one of the questions
investigated by the authors of an article. Each student in a random
sample of 46 male students at a university in England and each
student in a random sample of 38 female students from the same
university kept a diary of how he or she spent time over a
three-week period.
For the sample of males, the mean time spent...

Of 400 students, 150 are male students and 250 are female
students, 60 of the male students and 90 of the female students
fail the statistics course. A student is selected at random from
these 400 students. What is the probability that the selected
student would be a male or fail the statistics course?
Select one:
a. 0.525
b. 0.15
c. 0.75
d. 0.6
A prospective developer of a shopping mall in an area believes
that the average annual income...

10. The paper "Facebook Use and Academic Performance Among
College Students: A Mixed-Methods Study with a Multi-Ethnic
Sample"† describes a survey of a sample of 66 male students and a
sample of 195 female students at a large university in Southern
California. The authors of the paper believed that these samples
were representative of male and female college students in Southern
California. For the sample of males, the mean time spent per day on
Facebook was 102.31 minutes. For the...

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