D-True /False ANSWER ANY 22 (22 points- 1 point each) 1- A cumulative frequency distribution provides a running total of the frequencies in the classes. 2-. If the occurrence of one event does not affect the occurrence of another event, then the two events are mutually exclusive. 3- When a statistic calculated from sample data is used to estimate a population parameter, it is called a point estimate. 4- An assumption underlying the use of tstatistic in sample-based estimation is that the population is normally distributed. 5- The mean of the sample means is not the same as the mean of the population 6- In order to find values in the fdistribution table, you must determine the appropriate degrees of freedom based on the sample sizes. 7- When the population standard deviation, is unknown the sample standard deviation, s, is used in determining the interval estimate for the population mean. - The null and the alternative hypotheses must be mutually exclusive and collectively exhaustive. 9- When a false null hypothesis is rejected, the researcher has made a Type II error. 10-Whenever hypotheses are established such that the alternative hypothesis is " ( # 8", where is the population mean, the hypothesis test would be a two-tailed test. 1- The rejection and non rejection regions are divided by a point called the critical value. 12- If a null hypothesis is not rejected at the 0.05 level of significance, the pvalue is bigger than 0.05 13- In testing hypotheses, the researcher initially assumes that the alternative hypothesis is true and uses the sample data to reject it. 14. When a true null hypothesis is rejected, the researcher has made a Type | error. 15. To test hypotheses about the equality of two population variances, the ratio of the variances of the samples from the two populations is tested using the Ftest. 16- The statistical methods of analysis of variance (ANOVA) assume that the populations are normally distributed. 4 17- Determining the table value for the F distribution requires two values for degrees of freedom. 18-If the correlation coefficient between two variables le -1, It means that the two variables are not related. 19- The process of constructing a mathematical model or function that can be used to predict or determine one variable by another variable le called regression analysis. 20- The probability of committing a Type I error is called the power of the test. 21-Power is equal to (1 -7), the probability of a test rejecting the null hypothesis that is indeed false. 22- The F statistic is a ratio of two independent sample variances. 23- An interval estimate can be computed by adding and subtracting a margin of error to the point estimate. 24- In regression, the variable that Is being predicted is usually referred to as the Independent variable. 25- In regression, the predictor variable le called the dependent variable