3a. (Data calories.txt) Refer to the caloric intake description. We are interested in determining whether the difference in treatments is real or is simply due to chance variation. Answer the following questions: (a) Do the sample for the first treatment follow the normal curve [Select] (b) Do the sample for the second group follow the normal curve? (c) What is the experimental unit? [Select] (d) How many populations? [Select] (e) How many measurements per experimental unit? [Select] (f) Is this a one-sample or two-sample problem? [Select] Yes, the histogram follow exactly the normal curve The histogram doesn't follow the normal curve exactly, but No, the histogram is clearly very far from the normal curve None of these answers seem appropriate. Please see my

Smoking is detrimental to health. The following shows the years of smoking and life expectancy at the age of 40 for 5 female employees working at Ernst & Young. Employee ? Anne Lena Ying Hyuna Sasha ?? 25 22 5 20 17 ?? 63 62 75 72 68               (i)         Treating the data as a sample, compute ??? and ???.             (ii)        Treating the data as the population, compute ??? and ???.

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…

How productive are U.S. workers? One way to answer this question is to study annual profits per employee. A random sample of companies in computers (I), aerospace (II), heavy equipment (III), and broadcasting (IV) gave the following data regarding annual profits per employee (units in thousands of dollars). I II III IV 27.9 13.5 22.2 17.9 23.2 9.6 20.5 16.4 14.7 11.1 7.7 14.5 8.3 8.9 12.7 15.9 11.8 6.5 7.7 10.6   19.1   9.5 What are the degrees of freedom? (numerator) (denominator)(c) Find the P-value of the sample test statistic. P-value > 0.100 0.050 < P-value < 0.100     0.025 < P-value < 0.050 0.010 < P-value < 0.025 0.001 < P-value < 0.010 P-value < 0.001 (d) Based on your answers in parts (a) to (c), will you reject or fail to reject the null hypothesis? Since the P-value is greater than the level of significance at α = 0.05, we do not reject H0. Since the P-value is less than or equal to the level of significance at α = 0.05, we…