Question

statistics help

15) Express the alternative hypothesis in symbolic form. A professor dlaims that the mean amount of time (in hours) sophomores spent studying for the statistics final exam is more than that of freshmen. Assume that the two samples are independent. Let the freshmen be the first population and the sophomores be the second 16) Assume that the following confidence interval for the difference in the mean length of male (sample 1) and birth was constructed using independent simple random female babies ( (sample 2) at -02 in<P1 2 1.7 in. What does the confidence interval suggest about the difference in length between male babies and female babies? 17) Given the linear corelation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represemts a significant linear correlation. Use a significance level of 0.05. 0543, 25 18) Use the given information to find the coefficient of determination. A regression equation is obtained for a collection of paired data. It is found that the total variation is 20.711, the explained variation is 18.592, and the unexplained variation is 2119. 19) Find the value of the linear correlation coefficient r. The paired data below consist of the temperatures on randomly chosen days and the amount a certain kind of plant grew (in millimeters). Temperature 62 76 50 51 71 46 51 44 79 36 39 50 13 33 33 17 6 16 Growth 20) Find the explained variation for the paired data. The equation of the regression line for the paired data below is y6.182864.33937x x 9 7 23 4 22 17 у| 43 35 1621 23 102 81 21) Use the given data to find the equation of the regression line. Round the final values to three significant digits, if necessary. Two different tests are designed to measure employee productivity and dexterity. Several employees are randomly selected and tested with these results 23 25 28 2 21 25 26 30 34 |36 Dexterity )49 53 59 42 47 53 55 63 67 75 Productivit

Answer 1

Lut, has men tince genanl Lngen i tingh han ferals babie miai tao fumale

eal value s 3.69 2 thene e n inenr WAM Tobal Marwalǐn

32, 81 6, 18 286 + 4.9393チ? xplaud nand alim 783 , 23 2 8614 29 S403 4 o, 649 17- 74 . 45215- uns ke

>トc(23, 25, 28, 21, 21, 25,26,30,34,36) s y=c (49, 53, 59,42, 47, 53, 55, 63, 67,75) Call: Coefficients: (Intercept) 5.055 1.905