Jan 21 Statistic for the day: The width of train tracks is 4 feet 8.5 inches. Why? Assignment: Read Chapter 9 Exercises from Chapter 8: 16, 18 These slides.

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Jan 21 Statistic for the day: The width of train tracks is 4 feet 8.5 inches. Why? Assignment: Read Chapter 9 Exercises from Chapter 8: 16, 18 These slides were created by Tom Hettmansperger and in some cases modified by David Hunter

Research Question 1: How high should I build my doorways so that 99% of the people will not have to duck? Secondary Question 2: If I built my doors 75 inches (6 feet 3 inches) high, what percent of the people would have to duck?

Find the value at Question 1 so that 99% of the distribution is below it. The value at Question 2 is 75; find the amount of distribution above it.

Z-Scores: Measurement in Standard Deviations Given the mean (68), the standard deviation (4), and a value (height say 75) compute This says that 75 is 1.75 standard deviations above the mean. Z = (75-mean) / SD = (75-68) / 4 = 1.75

Answer to Question 2: What percent of people would have to duck if I built my doors 75 inches high? Recall: 75 has a Z-score of 1.75 From the standard normal table in the book:.96 or 96% of the distribution is below Hence,.04 or 4% is above So 4% of the distribution is above 75 inches.

The value at Question 2 is 75; find the amount of distribution above it. Convert 75 to Z = 1.75 and use Table 8.1 in book.

Question 1: What is the value so that 99% of the distribution is below it? Called the 99 th percentile. 1.Look up the Z-score that corresponds to the 99 th percentile. From the table: Z = Now convert it over to inches: Since 77 inches is 6 feet 5 inches, 99% of the distribution is shorter than 77 inches and they will not have to duck = (h – 68)/4 h = (4) = 77.3

Find the value at Question 1 so that 99% of the distribution is below it. Look up Z-score for 99 th percentile and convert it back to inches.

Compare Heights of Females and Males

Shaquille O’Neal is 7 feet 1 inch or 85 inches tall. How many people in the country are taller? 1.We will assume that heights are normally distributed with mean 68 inches and standard deviation 4 inches. 2.O’Neal’s Z-score is Z = (85-68)/4 = In other words O’Neal is 4.25 standard deviations above the mean! We would generally consider him from a different population. 3. There is above 4.25 standard deviations.

3.There are roughly 250 million people in US. 48.8% are over the age of 20. That is 122 million. 4.Hence, there should be roughly times 122 million or 1342 people taller than Shaquille O’Neal

What is your Z-Score? What is your percentile? How many PSU students are taller? Who Is the Tallest Person in Class?

Suppose someone claims to have tossed a coin 100 times and got 70 heads. Would you believe them? We need to know what the distribution of the number of heads in 100 tosses looks like for a fair coin. We need to know what the distribution of the number of heads in 100 tosses looks like for a fair coin. We need the mean and standard deviation for this distribution. We need the mean and standard deviation for this distribution.

1.What is the mean? 2.What is the standard deviation? 3.Let’s suppose the smooth version is bell shaped.

So the distribution of the number of heads in 100 tosses of a fair coin is: Roughly normal, mean about 50, SD about 5 Roughly normal, mean about 50, SD about 5 What is the Z-score of 70? What is the Z-score of 70? Ans: 4 Ans: 4 What is the percentile? What is the percentile? Ans: or % Ans: or % Now do you believe them? Now do you believe them? NO NO Weighted coin is a BETTER explanation Weighted coin is a BETTER explanation