QNT 275 FINAL EXAM

QNT 275 FINAL EXAM The regression model y = A + Bx + e is: • a nonlinear model • a deterministic model • a probabilistic model • an exact relationship 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