Chapter 8: Q.14 (page 478)
In words, define the random variable .
- the weight in kilograms of the heads of lettuce.
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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.
Construct a localid="1648450905983" confidence interval for the true mean number of colors on national flags.
Fill in the blanks on the graph with the areas, the upper and lower limits of the Confidence Interval and the sample mean.
Which distribution should you use for this problem ?
The standard deviation of the weights of elephants is known to be approximately pounds. We wish to construct a % confidence interval for the mean weight of newborn elephant calves. Fifty newborn elephants are weighed. The sample mean is 244 pounds . The simple standard deviation is 11 pounds.
1. Identify the following:
a. x- = _____
b. σ= _____
c. n= _____
If the Census did another survey, kept the error bound the same, and surveyed only people instead of , what would happen to the level of confidence? Why?
Of 1,050 randomly selected adults, 360 identified themselves as manual laborers, 280 identified themselves as non-manual wage earners, 250 identified themselves as midlevel managers, and 160 identified themselves as executives. In the survey, 82% of manual laborers preferred trucks, 62% of non-manual wage earners preferred trucks, 54% of mid-level managers preferred trucks, and 26% of executives preferred trucks.
We are interested in finding the 95% confidence interval for the percent of executives who prefer trucks. Define random variables X and P′ in words.
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