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A variable such as eye color is also referred to as a(n) _____________ variable.
High school students were interested in a teacher's claim that the longer the length of
time (hours) that a student studies for a test, the higher the test score. The students
collected the data and the teacher did the regression analysis with the following results.
If a student studies 10 hours, what is the predicted score?
A study by a bank compared the average savings of customers who were depositors for
three years or less with those who had been depositors for more than three years. The
results of a sample are:
To test that the two groups of customers have equal savings rates, what is the critical
value of z using α = 0.05?
Refer to the following breakdown of responses to a survey of room cleanliness in a
hotel.
What percent of the responses indicated that customers were satisfied?
The mean monthly income of a group of college students is $500; the standard
deviation is $50. According to Chebyshev's theorem, at least what percent of the
incomes will lie between $400 and $600?
If the null hypothesis, H0: β1 = 0, is rejected, the independent variable, X1, it has a
______ effect on the dependent variable.
If the mean of a distribution is smaller than the median and mode, the sign of Pearson's
coefficient of skewness is ______________.
If the computed value of a chi-square statistic is greater than the critical value, the null
hypothesis is ________.
In a one-way ANOVA, ______ degrees of freedom are associated with the numerator of
the F ratio.
A company wants to study the effect of an employee's length of employment on their
number of workdays absent. The results of the regression analysis follow.
What is the slope of the linear equation?
A company is studying the number of daily debit card purchases. There were 20
purchases and the probability of a debit card purchase is 0.5. Based on the shape of the
distribution, approximately 99.7% of the purchases should be between _______ and
________.
Twenty-one executives in a large corporation were randomly selected to study the effect
of several factors on annual salary (expressed in $000s). The factors selected were age,
seniority, years of college, number of company divisions they had been exposed to, and
the level of their responsibility. The results of the regression analysis follow:
Test the hypothesis that the regression coefficient for education is equal to 0 at the 0.05
significance level. Report the degrees of freedom, the critical value, the test statistic,
and your decision.
The coefficient of correlation and the slope of the regression line always have their
__________ in common.
The weekly sales from a sample of 10 computer stores yielded a mean of $25,900, a
median of $25,000, and a mode of $24,500. Given this, the shape of the distribution
would be _________.
In a multiple regression model, the ____ test statistic is used to test the significance of
an independent variable's regression coefficient.
In ANOVA, when we do not reject the null hypothesis, ______ inference is made about
the population means.
