QNT 275 FINAL EXAM

QNT 275 FINAL EXAM 26/30 for a 87% 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: • equal to $110,000 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 In a hypothesis test, a Type I error occurs when: a true null hypothesis is rejected 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: skewed to the right A quantitative variable is the only type of variable that can: assume numeric values for which arithmetic operations make sense 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: sample mean An error that occurs because of chance is called: sampling error The regression model y = A + Bx + e is: an exact relationship In a one-way ANOVA, we analyze only one: variable