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