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Stats Midterm Questions With Complete Solutions
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Stats Midterm Questions With Complete Solutions
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Stats Midterm Questions With Complete Solutions___is the probability of a Type II error; and ___ is the
probability of correctly rejecting a false null hypothesis. Correct
Answer β; 1-β
200 students took a standard chemistry test. You sampled 20
students to estimate the average score and the standard
deviation. How many degrees of freedom were there in the
estimation of the standard deviation? Correct Answer 19
200 workers from a factory participated in an end of the year
evaluation. Their manager creatively decided to give each of
them their Z- score instead of their grade. Alex got his Z- score
of +3.0. He was wondering how well he did on the evaluation.
Correct Answer If was very good, much better than almost all
of the other workers in the factory.
A binomial distribution is a probability distribution for _____
events for which there are _______ possible outcomes Correct
Answer independent; two
A cognitive psychologist is interested in comparing two ways of
presenting stimuli on sub- sequent memory. 12 subjects are
presented with each method and a memory test is given. What
would be the roles of descriptive and inferential statistics in the
analysis of these data? Correct Answer Descriptive statistics
would be used to describe and analyze the data that was
collected from the 12 subjects whereas inferential statistics
would be used if we were to take the data from the sample of 12
subjects and generalize it for a population of people.
,A company just purchased 1,000 Tvs. From the product label,
the weight of on TV should be 15.4 pounds. The manager of the
company randomly selected 20 TVs and measured their weights.
Then, he repeated this procedure again 3 times. The means and
standard errors are listed as follows. Which sample estimate
shows the least sample variability? Correct Answer Sample 2:
mean=15.0, SE=.6
A dot plot can be used to display Correct Answer the
distribution of one quantitative variable
A frequency distribution is a Correct Answer tabular summary
of a set of data showing the number of items in each of several
non overlapping classes
A graph declining to the right Correct Answer A positive skew
A normal distribution with a mean of 10 and standard deviation
of 5. What is the corresponding Z score for a cade having a
value of 7? Correct Answer -.6
A portion of the population selected to represent the population
is called Correct Answer A sample
A probability distribution for all possible values of a sample
statistic is known as a Correct Answer sampling distribution
A professor assumed there was a correlation between the
amount of hours people were exposed to sunlight and their blood
, vitamin D level. The null hypothesis was that the population
correlation was Correct Answer 0.0
A professor believed that these is a correlation between people's
weights and number of times they eat out. He recorded a group
of students' weights (measured in lbs.) and the number of times
they ate out last week. The r value was .90. We can tell that the
correlation between students' weights (measured in kilogram)
and the number of times they ate out last week is: Correct
Answer .90
A professor posed a hypothesis that there was no difference
between boys and girls on their soda consumption per day in an
elementary school. He randomly sampled 25 boys and 25 girls.
The mean soda consumption for boys was 40 oz per day and the
standard deviation was 5. The mean soda consumption for girls
was 30 oz per day and the standard deviation was 5. If he used a
two-tailed t test to compare the mean soda consumption between
boys and girls, what was the computed t-value? Correct Answer
7.09
A professor posed a hypothesis that there was no significant
difference between boys and girls on their soda consumption per
day in an elementary school. He randomly sampled 25 boys and
25 girls. The mean soda consumption for boys was 40 oz per
day and the standard deviation was 5. The mean soda
consumption for girls was 30 oz per day and the standard
deviation was 5. What is the standard error of the difference in
means? Correct Answer 1.41
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