When computing the standard deviation, does it matter whether the data are sample data or data comprising the entire population? Choose one answer: A. Yes. The formula for s is divided by n, while the formula for ? is divided by N − 1. B. Yes. The formula for s is divided by n − 1, while the formula for ? is divided by N.     C. No. The formula for both s and ? is divided by n − 1. D. No. The formula for both s and ? is divided by N.

Answer.

In a city with three high schools, all the ninth graders took a Standardized Test, with these results: High School Mean score on test Number of ninth graders Glenwood 80 289 Central City 93 342 Lincoln High The city's PR manager, who never took statistics, claimed the mean score of all ninth graders in the city was 80. Of course, that is incorrect. What is the mean score for all ninth graders in the city? Round to one decimal place. 67 170 mean of all ninth grader's scores =

Three students were applying to the same graduate school. They came from schools with different grading systems. Vichet is Kamala is Number Number Student GPA School Average GPA School Standard Deviation Thuy 2.4 2.2 0.5 Vichet 85 96 How many standard deviations is each student away from hiir school average? If the student GPA is higher than his school average, enter this as a positive number. If the student GPA is lower than his school average, enter this as a negative number. Thuy is Number Kamala 8.7 8.2 Table 2.74 20 0.8 standard deviations from Thuy's school average. standard deviations from Vichet's school average. standard deviations from Kamala's school average.

Steve's average golf score at his local course is 92.9 from a random sample of 60 rounds of golf. Assume that the population standard deviation for his golf score is 4.2. The standard error of the mean for this sample is ________. A)  0.54 B)  1.17 C)  1.56 D)  2.30

The test scores on a science quiz were:  50  50  63  71  74  74  75  77  78  80  85  99. This is a population! ALL QUIZ GRADES!  Determine the mean (round to the nearest whole number) and standard deviation (Round to the hundredth place- two decimals).  The mean is?     and the deviation is ?