1. In 2003, Major League Baseball took steps to speed up the paly of baseball games in order to maintain fan interest. In a sample of 94 games in 2002, 36 finished in less than 3 hours. A similar survey in 2003 of 79 games found that 40 finished in less than 3 hours. When testing the hypothesis (at the 5% level of significance) a higher percentage of games finished in less than 3 hours in 2003. A. What is the test statistic?B. Historical data indicate a population standard deviation of 12 minutes is a reasonable assumption for both years. Conduct the hypothesis test. C. What is the point estimate, in minutes, of the reduction in the mean duration of games during the 2003 season?D. What is the p-value (to 4 decimals)?2. Provide a 95% confidence interval estimate of the reduction in the mean duration of games during the 2003 season (to 1 decimal).

I’m stuck on this i don’t understand.

On #16 : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.

Determine if the following statement is true or false. the normal curve is symmetric about its​ mean, mu. choose the best answer below. a. the statement is false. the normal curve is not symmetric about its​ mean, because the mean is the balancing point of the graph of the distribution. the median is the point where​ 50% of the area under the distribution is to the left and​ 50% to the right.​ therefore, the normal curve could only be symmetric about its​ median, not about its mean. b. the statement is true. the normal curve is a symmetric distribution with one​ peak, which means the​ mean, median, and mode are all equal.​ therefore, the normal curve is symmetric about the​ mean, mu. c. the statement is false. the mean is the balancing point for the graph of a​ distribution, and​ therefore, it is impossible for any distribution to be symmetric about the mean. d. the statement is true. the mean is the balancing point for the graph of a​ distribution, and​ therefore, all distributions are symmetric about the mean.