Chapter 7: Q. 27 (page 429)
For the sums of distribution to approach a normal distribution, what must be true?
Short Answer
The sample size is used to know the number of individuals who play an active role in statistical terms.
Chapter 7: Q. 27 (page 429)
For the sums of distribution to approach a normal distribution, what must be true?
The sample size is used to know the number of individuals who play an active role in statistical terms.
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Get started for freeFind the sum that is standard deviations below the mean of the sums.
82. Would you be surprised, based upon numerical calculations, if the sample average wait time (in minutes) for 100 riders was less than 30 minutes?
a. yes
b. no
c. There is not enough information.
The distribution of income in some Third World countries is considered wedge shaped (many very poor people, very few middle income people, and even fewer wealthy people). Suppose we pick a country with a wedge shaped distribution. Let the average salary be per year with a standard deviation of . We randomly survey residents of that country.
a. In words,
b. In words,
c.
d. How is it possible for the standard deviation to be greater than the average?
e. Why is it more likely that the average of the residents will be from to than from ?
A uniform distribution has a minimum of six and a maximum of ten. A sample of is taken.
Find the th percentile for the sums.
Previously, De Anza statistics students estimated that the amount of change daytime statistics students carry is exponentially distributed with a mean of . Suppose that we randomly pick daytime statistics students.
a. In words,
b.
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d.
e. Find the probability that an individual had between . Graph the situation, and shade in the area to be determined.
f. Find the probability that the average of the 25 students was between . Graph the situation, and shade in the area to be determined.
g. Explain why there is a difference in part e and part f.
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