Chapter 8: Q.11 (page 477)
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?
Short Answer
The confidence level decreases.
Chapter 8: Q.11 (page 477)
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?
The confidence level decreases.
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Get started for freeOf 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.
Which distribution should you use for this problem?
If it were later determined that it was important to be more than confident and a new survey was commissioned, how would it affect the minimum number you need to survey? Why?
Identify the following:
a. x=_______
b. sx =_______
c. n =_______
d. n โ 1 =_______
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. ฯ= _____
c. n= _____
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 confidence interval for the true mean number of colors on national flags.
Calculate the following:
a. lower limit
b. upper limit
c. error bound
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