STAT 200 Quiz 3
April 30, 2017
1.
A researcher believed that there was a difference in the amount of time boys and girls at
7th grade studied by using a two-tailed t test. Which of the following is the null
hypothesis?
a. Mean of hours that boys studied p
Week 4 Homework
4/9/2017
1. Assume the speed of vehicles along a stretch of I-10 has an approximately normal distribution
with a mean of 71 mph and a standard deviation of 8 mph.
a. The current speed limit is 65 mph. What is the proportion of vehicles les
Week 6 Homework
April 23, 2017
1. You choose an alpha level of 0.01 and then analyze your data.
a. What is the probability that you will make a Type I error given that the null hypothesis is
true?
i. The probability that you will make an error is 0.01.
b.
Week 5 Homework
4/16/17
1. Why is a 99% confidence interval wider than a 95% confidence interval?
a. A confidence interval contains the true population mean. If I have a 95% confidence
interval, that means I am 95% certain that the true population mean is
Week 2 Homework
Lane:
Chapter 2:
7. a. pie graph
1977 Stat. and Biom. 200 Class for Eye Color
1
4
11
10
Brown
Blue
Green
Gray
b. Horizontal Bar Graph
1977 Stat. and Biom. 200 Class for Eye Color
Gray
Green
Eye Color
Blue
Brown
0
2
4
6
Number of Students
C
April 30, 2017
Week 7 Homework
1. The formula for a regression equation is
Y ' =2 X +9 .
a. What would be the predicted score for a person scoring 6 on X?
i. Y = 21
b. If someones predicted score was 14, what was this persons score on X?
i.
x=
5
2
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STAT 200 Quiz 2
April 23, 2017
1. The singular form of the word dice is die. Tom was throwing a six-sided die. The
first time he threw, he got a three; the second time he threw, he got a three again. Whats
the probability of getting a three at the third t