26.) Which statement best detmes the concept of the distribution of sample means

Question

26.) Which statement best detmes the concept of the distribution of sample means? a it is a distribution of all the possible means of a specified (n) taken from a population b. it is a distribution of sample statistics (a sampling distrbution) c. it is a distribution of all the possible raw scores taken from a population d.both answers and b 27) Which statement best defines the concept of sampling etror? a the discrepancy between two population distributions b. the discrepancy between two sample distributions c. the discrepancy between sample statistics and population parameters d the discrepancy between sample parameters and population statistics 28.) All of the following are characteristics of a distribution of sample means EXCEPT a sample means should occur mostly near this distribution's mean b. with larger n's, this distribution becomes more variable c with smaller n's, this distribution becomes more variable d. all of the above Chapter S: Introduction to Hypothesis Testing 29.) Which of the following are true about the concept of statistical power? a it is the probability that a hypothesis test will falsely reject a true null hypothesis b. it is the probability that a hypothesis test will correctly reject a false null hypothesis c. it is also known as Type I Error (a) d it is a useless piece of information with respect to hypothesis testing 30.) Hypothesis testing is a form of about a which usesdata to evaluate a hypothesis a descriptive statistics, population: sample b. inferential statistics; population; sample c inferential statistics, sample, population d descriptive statistics, sample; population 31) Which of the following does NOT apply to the a-level(alpha) for any given hypothesis test? a the a-level corresponds to the probability of a Type m Error b. the a-level corresponds to the probability of a Type I Error c. the -level plays a role in determining critical regions for a hypothesis test d none of the above (all of the above answers apply) 32) Among the hypothesis tests covered in lecture, which hypothesis test is best used for drawing conclusions about a population when the population standard deviation is known? a independent measures t-test b repeated measures t-test c one-sample, independent measures ANOVA d. the z-test

Explanation / Answer

(26)

It is a distribution of all the possible sample means of a specified sample size taken from a population.

(27)

Sampling error is the discrepancy between the sample statistic and the known population parameter.

(28)

The following is not a characteristic of sampling distribution:

With larger n's, the distribution becomes more variable.

(30)

Hypothesis testing is a type of inferential statistics, which uses sample data to evaluate a hypothesis about a population parameter.

(31)

The following statement is false:

The alpha level corresponds to the probability of type II error.

(32)

z-test is used when the population SD is known to us. The t-tests are used when population SD is unknown.

Hope this helps !

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