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The number of semester hours of college credit taken by first-time candidates for a certain professional exam has a Normal distribution with a mean of 120 hours and a standard deviation of 16 hours. Consider a random sample of n first-time candidates for the exam and let x represent the mean number of hours of college credit taken for the sample. Complete parts a through e below. Click the icon to view the table of normal curve areas. ..... a. Describe the shape of the sampling distribution of x. A. The shape is Normal distribution only when sample size is greater than 30 B. The shape is Normal distribution for any sample size O C. is always the same as the distribution of the population D. The shape is skewed right b. If 16 first-time candidates for the exam are randomly selected, what is the probability that the mean number of hours of college credit taken by these students x is between 118 and 122 hours? P(118 < x <122) = (Round to four decimal places as needed.) c. If 64 first-time…

1. Use the following methods to test Hoμ₁ = μ2 versus H₁ μ₁ μ2 for the data in worksheet 9.1 of the Excel data file: a. Tukey's Quick Test b. A boxplot slippage test c. The two-sample t test d. The Mann-Whitney test (use Stat> Nonparametrics> Mann-Whitney)

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The table shows the number of monthly active users of a social media website (the number of people who use the website at least once a month) over a three-year period. Complete parts (a) through (c). Month March 2009 March 2010 March 2011 March 2012 Monthly active users (millions) 192 422 660 901 Absolute change over previous year Percent change over previous year a. Fill in the row of the table showing the absolute change in the number of active monthly users. Month March 2009 March 2010 March 2011 March 2012 192 422 Monthly active users (millions) 660 901 Absolute change over previous year (Type integers or decimals rounded to the nearest tenth as needed.) b. Fill in the row of the table showing the percent change in the number of active monthly users. apt March 2010 422 Month March 2009 192 Monthly active users (millions) Percent change over previous year March 2011 March 2012 901 660 % % 96 (Type integers or decimals rounded to the nearest tenth as needed.) c. Is the increase in…