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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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.
What is estimating?
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.
Construct a confidence interval for the population mean time spent waiting. State the confidence interval, sketch the graph, and calculate the error bound .
You do a study of hypnotherapy to determine how effective it is in increasing the number of hours of sleep subjects get each night. You measure hours of sleep for subjects with the following results. Construct a % confidence interval for the mean number of hours slept for the population (assumed normal) from which you took the data. ; ; ; ; ; ; ; ; ; ; ;
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.
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