Statistics MCQs with Answers – Practice Online – Page 4

Question 61 Statistical Inference

What are the 95% confidence limits for a population proportion P?

Correct answer A. p ± 1.96√(pq/n)

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Question 62 Statistical Inference

What is the hypothesis that is actually being tested called?

Correct answer B. Null hypothesis

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Question 63 Statistical Inference

A Type II error is committed when the null hypothesis is?

Correct answer B. Accepted when it is false

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Question 64 Statistical Inference

Which of the following cannot be a null hypothesis H0?

Correct answer A. θ ≠ θ0

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Question 65 Statistical Inference

If the null hypothesis is H₀: θ = θ₀, how is the general (two-sided) alternative hypothesis stated?

Correct answer D. H₁: θ ≠ θ₀

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Question 66 Statistical Inference

What is the first step in testing a hypothesis?

Correct answer D. Stating H0

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Question 67 Statistical Inference

Which criteria are used to judge whether a point estimator is good?

Correct answer D. All of the above

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Question 68 Statistical Inference

The consistency of an estimator can be checked by comparing its?

Correct answer B. Variance

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Question 69 Statistical Inference

Herbicide A has long been used to kill a certain weed. An experiment will test whether a new Herbicide B is more effective; A stays in use unless there is enough evidence that B is better. What is the alternative hypothesis?

Correct answer B. Herbicide B is more effective than Herbicide A

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Question 70 Statistical Inference

Which assumption underlies the use of the t-distribution?

Correct answer B. The samples are drawn from a normally distributed population

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Question 71 Statistical Inference

What is the shape of the t-distribution?

Correct answer C. Symmetrical

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Question 72 Statistical Inference

Which statement correctly compares the t-distribution with the standard normal distribution?

Correct answer A. The greater the degrees of freedom, the more the t-distribution resembles the standard normal distribution

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Question 73 Statistical Inference

When is the Mann-Whitney U test preferred to a t-test?

Correct answer A. The assumption of normality is not met

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Question 74 Statistical Inference

What does the sign test assume about the samples?

Correct answer B. Samples are dependent

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Question 75 Statistical Inference

Six people each rate three brands of coffee for taste on a scale of 1 to 10, giving 18 observations. Which test is appropriate for checking whether the brands taste equally good?

Correct answer C. Kruskal-Wallis test

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Question 76 Statistical Inference

To perform a runs test for randomness, the data must be?

Correct answer C. Divided into exactly two classifications

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Question 77 Statistical Inference

What does Spearman’s rank correlation test require of the data?

Correct answer B. Data should be of ordinal scale at least

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Question 78 Statistical Inference

In a Wilcoxon rank-sum test, which statement about ties is correct?

Correct answer A. Ties between the two samples may affect the decision

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Question 79 Statistical Inference

In the sign test, what is done when the two scores in a pair are tied?

Correct answer C. We discard them

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Question 80 Statistical Inference

A Wilcoxon rank-sum test can be?

Correct answer A. Either of the above

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