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Stats Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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Stats Exam | Questions And Answers Latest {2024- 2025} A+ Graded | 100% VerifiedThe power of the decision-making process is - the likelihood of rejecting a false null hypothesis
stated by an alpha level
Researchers state a level of significance in terms of an alpha level. The alpha level indicates - all of the
above
Given the following values: μ = 6.0, M = 7.6, n = 36, σ = 6, conduct a one-sample z test at a .05 level of
significance. For a one-tailed test, upper-tail critical, what is the decision? - to retain the null hypothesis
The one-sample z test is a hypothesis test used to test hypotheses - concerning a single population with
a known variance
A researcher selects a sample of 36 students from a school population with a mean IQ of 100 and
standard deviation of 12. She determines that the mean IQ in this sample is 104. Assuming she
computes a one-sample z test at a .05 level of significance, what is the decision for a two-tailed test? -
Reject the null hypothesis; IQ scores in this sample are significantly higher than those in the copulation
A researcher computes a test statistic and finds that the p value for this test is .03. What does this result
mean? - There is a 3% likelihood of obtaining the test statistic value, if the null were true.
A measure of the size of an effect in a population is called - effect size
Hypothesis testing is also called - significance testing
Based on the effect size conventions, d = 0.99 is a - large effect size
A researcher obtains z = 3.98 for a one-sample z test. If her decision is to retain the null hypothesis, then
what do you know about her decision? - Her decision resulted in a Type III error.
, A researcher records the following assessment data: 42 + 6 (M + SD). The researcher only wants to
sample participants scoring in the top 20% of this assessment. What is the cutoff score for the top 20%
in this example? - 47.04
Two normal distributions are observed. The first distribution has a mean of 12 and a standard deviation
of 2. The second distribution has a mean of 0 and a standard deviation of 2. For which distribution will
the z score for the mean be larger? - None, the z score will be the same
Which of the following is required to locate proportions of area under the normal curve? - both A and B
A therapist goes through her records and finds that 200 of her 400 patients showed significant
improvement in mental health over the past year. Hence, the probability of her patients showing
significant improvement in mental health is - .50
A professor finds that the students scored a 76 + 8 (M + SD) on the final exam. On this exam, a score of
90 is an A. Assuming these data are normally distributed, what is the z score for 90 (the cutoff for an A)?
- 1.75
State whether the first area is bigger, the second area is bigger, or the two areas are equal: the area to
the left of z = 0.80, or the area to the right of z = -0.80. - The two areas are the same.
A researcher records the following time spent sleeping per night (in hours) in a group of participants: 5.8
+ 1.8 (M + SD). The researcher decides to categorize participants who sleep between 6 to 8 hours as
moderate sleepers. What percentage of participants fell in this category? - About 35%
The unit of measurement distributed along the x-axis of a standard normal distribution is referred to as
a - Z score
The normal distribution has all of the following characteristics, except that - The total area under the
curve is greater than 1.0
A researcher determines that students study an average of 80 + 20 (M + SD) minutes per week.
Assuming these data are normally distributed, what is the z score for students studying 60 minutes per
week? - -1.0
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