QNT 275 FINAL EXAM
The regression model y = A + Bx + e is:
• a nonlinear model
• a deterministic model
• a probabilistic model
• an exact
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The mean of a discrete random variable is the mean of its:
• frequency distribution
• percentage distribution
• probability distribution
• second and third quartiles
The p-value is the:
• smallest significance level at which the null hypothesis cannot be rejected
• largest significance level at which the alternative hypothesis can be rejected
• largest significance level at which the null hypothesis can be rejected
• smallest significance level at which the null hypothesis can be rejected
A quantitative variable is the only type of variable that can:
• be graphed
• have no intermediate values
• assume numeric values for which arithmetic operations make sense
• be used to prepare tables
To make tests hypotheses about more than two population means, we use the:
• analysis of variance distribution
• normal distribution
• t distribution
• chi-square distribution
In a survey regarding job satisfaction, 574 in a sample of 934 female job-holders stated that they are satisfied with their jobs, while 500 in a sample of 755 male job-holders stated that they are satisfied with their jobs. The null hypothesis is that the proportions of all female and male job-holders who are satisfied with their jobs are the same. The alternative hypothesis is that the proportion of female job-holders who are satisfied with their jobs is lower than the proportion of male job-holders stated who are satisfied with their jobs. The significance level is 2.5%.
What is the critical value of z for the hypothesis test?
• -2.05
• -1.96
• -2.33
• -2.17
In a game of four-handed Hearts, all 52 cards of a standard deck are dealt, so that each player starts each round with 13 cards in a hand. Suppose player A’s hand has three clubs, six diamonds, two hears, and two spades. What is the relative frequency of spades, rounded to two decimal places, dealt to player A?
• 0.75
• 0.15
• 1.5
• 0.25
Two events are independent if the occurrence of one event:
• Means that the second event is certain to occur.
• Does not affect the probability of the occurrence of the other event.
• Affects the probability of the occurrence of the other event.
• Means that the second event cannot occur.
The model y = A + Bx is a:
• Deterministic model
• Nonlinear model
• Probabilistic model
• Stochastic model
For a goodness-of-fit test, the frequencies obtained from the performance of an experiment are the:
• Objective frequencies
• Observed frequencies
• Expected frequencies
• Subjective frequencies
Which of the following pairs of events are mutually exclusive?
• Male and yes
• Female and yes
• Female and male
• Female and no
A researcher wants to test if the mean annual salary of all lawyers in a city is different than $110,000. The null hypothesis for this example will be that the population mean is:
• Less than to $110,000
• Not equal to $110,000
• Equal to $110,000
• Greater than to $110,000
A qualitative variable is the only type of variable that:
• Cannot be measured numerically
• Cannot be graphed
• Can assume an uncountable set of values
• Can assume numerical values
For the one-tailed test, the p-value is:
• The area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis
• Twice the area under the curve to the same side of the value of the sample statistic as is specified in the alternative hypothesis
• The area under the curve between the mean and the observed value of the sample statistic
• Twice the area under the curve between the mean and the observed value of the sample statistic
Which of the following assumptions is not required to use ANOVA?
• The samples drawn from different populations are random and independent.
• All samples are of the same size.
• The populations from which the samples are drawn (approximately) normally distributed.
• The populations from which the samples are drawn have the same variance.
The alternative hypothesis is a claim about a:
• Parameter, where the claim is assumed to be true until it is declared false
• Statistic, where the claim is assumed to be false until it is declared true
• Statistic, where the claim is assumed to be true if the null hypothesis is declared false
• Parameter, where the claim is assumed to be true if the null hypothesis is declared false.
In a one-way ANOVA, we analyze only one:
• Variable
• Sample
• Population
• Mean [Show Less]