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Chapter 8: Q.59 (page 481)
In one complete sentence, explain what the interval means.
The interval means is between colors and colors.
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A sample of heads of lettuce was selected. Assume that the population distribution of head weight is normal. The weight of each head of lettuce was then recorded. The mean weight was pounds with a standard deviation of pounds. The population standard deviation is known to be pounds.
Identify the following:
a.
b.
C.
A student polls his school to see if students in the school district are for or against the new legislation regarding school uniforms. She surveys students and finds that are against the new legislation.
a. Compute a % confidence interval for the true percent of students who are against the new legislation, and interpret the confidence interval.
b.In a sample of students,% said they own an iPod and a smartphone. Compute a % confidence interval for the true percent of students who own an iPod and a smartphone.
Explain in complete sentences what the confidence interval means.
The data in the Table are the result of a random survey of national flags (with replacement between picks) from various countries. We are interested in finding a confidence interval for the true mean number of colors on a national flag. Let the number of colors on a national flag.
Calculate the following:
(a)
(b)
(c)
The Ice Chalet offers dozens of different beginning iceskating classes. All of the class names are put into a bucket. The 5 P.M., Monday night, ages 8 to 12, beginning ice-skating class was picked. In that class were 64 girls and 16 boys. Suppose that we are interested in the true proportion of girls, ages 8 to 12, in all beginning ice-skating classes at the Ice Chalet. Assume that the children in the selected class are a random sample of the population.
In words, define the random variable X.
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