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# Quiz 3- Soci 332 American Military university Statistics for social science

Part 1 of 1 -

Question 1 of 25
0.8 Points
What is a hypothesis?
A.a procedure for using descriptive statistics in research
B.a set of theories about certain facts, relationships, or events
C.a prediction about the results of a research study
D.a way of quantifying the normal curve Reset Selection

Question 2 of 25
0.8 Points
A researcher tests whether a new teaching method is more effective than the old one. What is the RESEARCH hypothesis?
A.The new teaching method is more effective than the old teaching method.
B.The old teaching method is more effective than the new teaching method.
C.There is no difference in effectiveness between the old teaching method and the new teaching method.
D.There is some difference in effectiveness between the old teaching method and the new teaching method, but which is more effective is not predicted. Reset Selection

Question 3 of 25
0.8 Points
A researcher tests whether there is any difference between how fast people work in the morning versus how fast they work in the evening. What is the NULL hypothesis?
A.People who work in the morning work faster.
B.People who work at night work faster.
C.There is some difference, but which is faster is not predicted.
D.There is no difference in the speed at which people work. Reset Selection

Question 4 of 25
0.8 Points
What represents the situation in which the null hypothesis is true?
A.the comparison distribution
B.the directional distribution
C.the nondirectional distribution
D.a one-tailed test Reset Selection

Question 5 of 25
0.8 Points
A result is considered statistically significant when a sample value is so extreme that:
A.the research hypothesis is rejected
B.the null hypothesis is accepted
C.the research hypothesis is accepted
D.the null hypothesis is rejected Reset Selection

Question 6 of 25
0.8 Points
How do you determine whether or not to reject the null hypothesis?
A.If the Z score is less than 1 or greater than +1
B.If the Z score is greater than +2.5
C.Compare the Z score needed to reject the null hypothesis to the actual sample Z score
D.Compare the standard deviation of the sample to the standard deviation of the population Reset Selection

Question 7 of 25
0.8 Points
If the null hypothesis is rejected, the researcher can conclude that the results:
A.support the research hypothesis
B.prove that the research hypothesis is true
C.were inconclusive
D.support the null hypothesis Reset Selection

Question 8 of 25
0.8 Points
Which of the following is NOT a correct statement of one of the five steps of hypothesis testing?
A.Restate the question as a research hypothesis and a null hypothesis about the populations.
B.Determine the characteristics of the comparison distribution.
C.Determine the cutoff score on the sample distribution at which the research hypothesis should be rejected.
D.Decide whether to reject the null hypothesis. Reset Selection

Question 9 of 25
0.8 Points
There is a special complication when using a two-tailed test. The researcher must:
A.multiply the significance percentage by .05
B.divide the significance percentage by .05
C.divide up the significance percentage between the two tails of the distribution
D.divide up the significance percentage by the four quartiles of the distribution Reset Selection

Question 10 of 25
0.8 Points
A Type I error is the result of:
A.improper measurement techniques on the part of the researcher
B.failing to reject the null hypothesis when, in fact, it is true
C.incorrectly rejecting the null hypothesis
D.incorrectly accepting the null hypothesis Reset Selection

Question 11 of 25
0.8 Points
Type II errors concern scientists because:
A.it could mean that a good theory or beneficial practice is not used
B.it means that the experiment must be repeated to confirm the positive result
C.rejecting the null hypothesis should only occur when the research hypothesis is true
D.future researchers might build entire theories based on a mistakenly significant result Reset Selection

Question 12 of 25
0.8 Points
The distribution of means is also called:
A.distribution of samples of means
B.standard deviation of the mean
C.sampling distribution of the mean
D.sampling distribution of the mode Reset Selection

Question 13 of 25
0.8 Points
The distribution of means is the correct comparison distribution when:
A.there is more than one person in a sample
B.there is less than one person in a sample
C.the mean is greater than the median in your sample
D.the mode is equal to the mean and median in your sample Reset Selection

Question 14 of 25
0.8 Points
Knowledge of what three important characteristics of the comparison distribution is required for hypothesis testing?
A.the median, mean, and variance
B.the mean, median, and mode
D.the mean, standard deviation, and size Reset Selection

Question 15 of 25
0.8 Points
In general, the shape of a distribution of means tends to be:
A.unimodal, symmetrical
B.bimodal, symmetrical
C.unimodal, skewed
D.rectangular, symmetrical Reset Selection

Question 16 of 25
0.8 Points
As the number of individuals in each sample gets larger, the distribution of means:
A.begins to look less and less like the normal curve (in terms of shape)
B.becomes a better approximation of the normal curve (in terms of shape)
C.becomes more positively skewed
D.becomes more negatively skewed Reset Selection

Question 17 of 25
0.8 Points
When a researcher has obtained a particular sample mean from a study, he or she compares it to:
A.the parameters of the known population distribution
B.an estimated distribution figured based on earlier research findings
C.the distribution of means of all the possible samples in the experimental condition from the research
D.the distribution of means that would arise if the null hypothesis were true Reset Selection

Question 18 of 25
0.8 Points
A distribution of means will be less spread out than the population of individuals from which the samples are taken because:
A.in a sample of scores, extremes tend to be balanced out, leaving fewer extreme means
B.in a sample of scores, there tend to be multiple extreme means
C.each sample is based on randomly selected individuals from the population
D.the more individuals in each sample, the more spread out will be the sample means Reset Selection

Question 19 of 25
0.8 Points
The standard deviation of the distribution of means is also known as the:
A.population standard deviation
B.variance of the error mean
C.standard error of the population
D.standard error of the mean Reset Selection

Question 20 of 25
0.8 Points
With samples of 30 or more individuals, the approximation of the distribution of means will be:
A.a bimodal distribution
B.a rectangular distribution
C.a normal curve
D.the distribution of Z scores Reset Selection

Question 21 of 25
0.8 Points
The variance of a distribution of means is the variance of the population of individuals:
A.multiplied by the number of individuals in each sample
B.divided by the number of individuals in each sample
C.squared
D.divided by the mean of the population Reset Selection

Question 22 of 25
0.8 Points
All of the following types of distributions are important for hypothesis testing EXCEPT:
A.the distribution of a population of individuals
B.the distribution of a particular sample of individuals taken from the population
C.the distribution of R scores
D.the distribution of means Reset Selection

Question 23 of 25
0.8 Points
The difference between creating a Z score from a single score and creating one from a sample mean is that:
A.you use the mean and standard deviation from the distribution of means
B.the estimated population variance is used directly
C.the difference score is divided by the sample’s standard deviation
D.only the population’s mean is used Reset Selection

Question 24 of 25
0.8 Points
The Z score of the sample mean on the distribution of means is:
A.different from a normal Z score because an estimated population standard deviation is used
B.smaller than normal due to the reduced variance in the distribution of means
C.conceptually similar to creating a Z score from a raw score
D.equivalent to the sample mean divided by the population variance Reset Selection

Question 25 of 25
0.8 Points
The best estimate of the population mean is the:
A.population median
B.sample mode
C.sample median
D.sample mean Reset Selection

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