QNT 275 FINAL EXAM ( 2021 LATEST UPDATE) GUARANTEE OF AN A+

QNT 275 FINAL EXAM Your exam has been submitted Status: Submitted on Oct 29, 2017, 7:50 PM Results: 29/30 (96.67%) The model y = A + Bx is a: • stochastic model • probabilistic model • nonlinear model • deterministic model To make tests of hypotheses about more than two population means, we use the: • chi-square distribution • t distribution • analysis of variance distribution • normal distribution A linear regression: • gives a relationship between two variables that cannot be described by a line • gives a relationship between two variables that can be described by a line • contains only two variables • gives a relationship between three variables that can be described by a line   A qualitative variable is the only type of variable that: • can assume an uncountable set of values • can assume numerical values • cannot be graphed • cannot be measured numerically For a 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 • the area under the curve between the mean and the observed value of the sample statistic • twice 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 between the mean and the observed value of the sample statistic The alternative hypothesis is a claim about a: • parameter, where the claim is assumed to be true if the null hypothesis is declared false • parameter, where the claim is assumed to be true until it is declared false • statistic, where the claim is assumed to be true if the null hypothesis is declared false • statistic, where the claim is assumed to be false until it is declared true   Which of the following assumptions is not required to use ANOVA? • The populations from which the samples are drawn have the same variance. • The samples drawn from different populations are random and independent. • The populations from which the samples are drawn are (approximately) normally distributed. • All samples are of the same size. An error that occurs because of chance is called: • sampling error • nonsampling error • probability error • mean error A researcher wants to test if elementary school children spend less than 30 minutes per day on homework. The alternative hypothesis for this example will be that the population mean is: • not equal to 30 minutes • less than 30 minutes • less than or equal to 30 minutes • equal to 30 minutes   The regression model y = A + Bx + e is: • a probabilistic model • a deterministic model • an exact relationship • a nonlinear model The mean of a discrete random variable is the mean of its: • frequency distribution • probability distribution • second and third quartiles • percentage distribution The mean of a discrete random variable is its: • box-and-whisker measure • second quartile • upper hinge • expected value   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 hearts, and two spades. What is the relative frequency of spades, rounded to two decimal places, dealt to player A? • 0.25 • 1.5 • 0.75 • 0.15 A continuous random variable x has a right-skewed distribution with a mean of 80 and a standard deviation of 12. The sampling distribution of the sample mean for a sample of 50 elements taken from this population is: • not normal • skewed to the right • approximately normal • skewed to the left Two paired or matched samples would imply that: • two data values are collected from the same source (elements) for two independent samples • data are collected on two variables from the elements of two independent samples • two data values are collected from the same source (elements) for two dependent samples • data are collected on one variable from the elements of two independent samples We can use the analysis of variance procedure to test hypotheses about: • two or more population means • two or more population proportions • the proportion of one population • the mean of one population Two events are independent if the occurrence of one event: • does not affect the probability of the occurrence of the other event. • means that the second event cannot occur. • affects the probability of the occurrence of the other event. • means that the second event is certain to occur. The p-value is the: • smallest significance level at which the null hypothesis can be rejected • largest significance level at which the null hypothesis can be rejected • smallest significance level at which the null hypothesis cannot be rejected • largest significance level at which the alternative hypothesis can be rejected   The p-value is the: • smallest significance level at which the null hypothesis can be rejected • largest significance level at which the null hypothesis can be rejected • smallest significance level at which the null hypothesis cannot be rejected • largest significance level at which the alternative hypothesis can be rejected A sample of 16 from a population produced a mean of 86.9 and a standard deviation of 14.3. A sample of 18 from another population produced a mean of 75.4 and a standard deviation of 15.9. Assume that the two populations are normally distributed and the standard deviations of the two populations are equal. The null hypothesis is that the two population means are equal, while the alternative hypothesis is that the mean of the first population is greater than the man of the second population. The significance level is 1%. What is the critical value of t for the hypothesis test? • 2.449 • 2.733 • 2.441 • 2.738 In a hypothesis test, a Type II error occurs when: • a true null hypothesis is not rejected • a true null hypothesis is rejected • a false null hypothesis is rejected • a false null hypothesis is not rejected question22 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? • -2.33 • -1.96 • -2.05 • -2.17 question23 In a one-way ANOVA, we analyze only one: • variable • mean • population • sample question24 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: • greater than to $110,000 • less than to $110,000 • equal to $110,000 • not equal to $110,000 question25 A quantitative variable is the only type of variable that can: • have no intermediate values • assume numeric values for which arithmetic operations make sense • be graphed • be used to prepare tables question26 Which of the following pairs of events are mutually exclusive? • Female and no • Female and male • Male and yes • Female and yes   question27 If you divide the number of elements in a sample with a specific characteristic by the total number of elements in the sample, the dividend is the: • sampling distribution • sample distribution • sample mean • sample proportion question28 For small degrees of freedom, the chi-square distribution is: • rectangular • skewed to the left • symmetric • skewed to the right question29 For a goodness-of-fit test, the frequencies obtained from the performance of an experiment are the: • observed frequencies • objective frequencies • subjective frequencies • expected frequencies question30 In a hypothesis test, a Type I error occurs when: • a false null hypothesis is rejected • a true null hypothesis is rejected • a false null hypothesis is not rejected • a true null hypothesis is not rejected