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15. A doctor claims that the proportion of Americans exercising the recommended minimum of 45 minutes per day is less than ten percent. A sample of 550 Americans reveals that 52 of them exercise at least 45 minutes per day. At the 10% significance level test the doctor’s claim.

For some reason I can't watch any of the videos. I tried going on Google Chrome and Internet Explorer, but none of them are playing the video on how to solve this problem.

If a person bought 1 share of Google stock within the last year, what is the probability that the stock on that day closed within $50 of the mean for that year (round to two places)? (Hint: this means the probability of being between 50 below and 50 above the mean). I cannot figure out the formula for this.. please help:)
M=1131.530876
SD=64.81327423

This is a general question about sample variance. What is a degree of freedom? The reference page given in my Stat textbook doesn't mention it by name, and could not find it here. Thanks so much!

For 14.4, problem 2: I think you got the wrong answer... p= .05 in the beginning, and you looked up .5 on the chart. Look out for this!

Chapter 8.2, Problem 7: I noticed for the other problems, we did the opposite or alternative for each value. Ho to Ha. How come we didn't do the alternative one for problem 7?

30. The following Minitab display was created from speed data collected on a strip of I-95 where the
speed limit is posted as 55mph. Use the Minitab display below to identify the point estimate for
the population mean, and interpret the 95% confidence interval provided by Minitab.

I am not sure how this went completely over my head and i know the answer is in my face. can you shed some light on this please professor.