When testing for the difference between the means of two normal populations using two independent ...

When testing for the difference between the means of two normal populations using two independent samples with equal variances and with sizes of nx = 20 and ny = 15, what is the number of degrees of freedom for the t test statistic?

A) 35
B) 33
C) 18
D) 13

Q. 2

Is it possible for a set of observations to be either a sample or a population? Give an illustrative example.

What will be an ideal response?

Q. 3

During a professor's office hours, students arrive, on average, every ten minutes. Assume that the distribution of the time between arrivals follows an exponential distribution. Suppose that a student has just left.

What is the probability that the professor has more than 20 minutes before the next student shows up?A) 0.8187
B) 0.8647
C) 0.1353
D) 0.1813

Q. 4

The type of diagram that shows subsets of the population on different branches is called a:

A) departmental diagram.
B) tree diagram.
C) Venn diagram.
D) scattered diagram.

Q. 5

Each set of data has 100 percentiles.

Indicate whether the statement is true or false

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When testing for the difference between the means of two normal populations using two independent ...

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