An ANOVA procedure is applied to data obtained from four distinct populations. The samples, each comprised of 17 observations, were taken from the four populations. The degrees of freedom for the numerator and denominator for the critical value of F are ________.   Multiple Choice   4 and 68, respectively   4 and 23, respectively   3 and 67, respectively   3 and 64, respectively

A consumer magazine wants to compare the lifetimes of ballpoint pens of three different brands (measured in days). The magazine takes a random sample of pens of each type in the following table. What is the correct test statistic? Brand 1 Brand 2 Brand 3 382 181 238 242 140 257 216 162 241 319 218 213 a. F (2, 9) = 5.54 b.r = -.34 c. t (11) = 12.16 d.p = .027

3.  Can SAT scores predict college performance?  Let x be a variable that represents SAT score of a computer science major, and let y be a variable that represents a student’s GPA upon graduation.  A random sample of n =15 computer science majors provided their SAT scores and GPAs: x 1232 1070 1086 1287 1130 1048 1121 1095 1135 1208 1333 1160 1186 1243 1261 y 3.52 2.91 2.4 3.47 3.47 2.37 2.4 2.24 3.02 3.32 3.59 2.54 3.19 3.71 3.58   The scatter diagram for the SAT score and GPA is given below:   (a)  Find the sample correlation coefficient r.  Truncate to two decimal places.  What does the value tell you about the data? (b)  Find the equation of the least squares line .  Truncate to four decimal places.  What does the slope mean? (c)  Find the value of the coefficient of determination .  Truncate to two decimal places.  What does this number mean? (d)  What is the predicted GPA if a computer science major got a…

Derby collects samples of insects in the forest and in a marsh to count the number of insects in each sample and then releases the insects. The number of insects in each sample from the two locations is provided below. Forest 1515 1313 1414 99 1616 1111 1515 1414 1515 1414 Marsh 1717 1414 1515 1717 1616 1818 1717 1919 1313 1616 What is the median and the interquartile range for each of the two locations? Round to one decimal place. The median number of insects in the forest samples is , and the interquartile range is . The median number of insects in the marsh samples is , and the interquartile range is .