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When an opinion poll calls residential telephone numbers at random, only 20% of the calls reach a live person. You watch the random dialing machine make 20 calls.
What is the probability (0.0001) that exactly 2 calls reach a person?
What is the probability (0.0001) that 2 or fewer calls reach a person?
A geography teacher is interested in the link between mathematical ability and the ability to visualize three dimensional situations.He gives a group of 15 students a test and records each students score
In a simple random sample of 30 days, what is the probability that the mean number of daily emergency admissions is between 75 and 95?
200 people were surveyed and asked to rate mayor Michael Bloombergs effectiveness towards education. The rate scale is 1 (lowest) to 10 (highest). Mayor Bloomberg's average rating was 7.50, with a standard deviation of 2
inclusions are defects in poured metal caused by contaminants. the number of large inclusions in cast iron follows a
question a convenience store owner hypothesizes that the median number of snow cones he sells per day is 36. a random
Test the claim that the mean age of the prison population in one city is less than 26 years. Sample data are summarized as n = 25, x = 24.4 years, and s = 9.2 years. Use a significance level of α = 0.05.
The distribution of hits/9-innings is approximately normal with mean 8.72 and standard deviation 1.10. Demonstrate, statistically, why a no-hitter is considered an extremely rare occurrence in MLB.
Calculate the average or the median of the average or medians of the samples and compare it with the average of the population.
Assume that a single radar unit used to detect incoming missiles has a probability of 0.90 of correctly detecting an incoming missile attack.
bev can either take a course in computers or in chemistry. if bev takes the computer course then she will receive an a
The mean (m) number of employee absences in company X is 6 days annually, according to previous studies conducted by the Human Resources Department.
We would like to test if the proportion of respondents that support the health care bill is less than 50% (a) what kind of hypothesis test is appropriate?
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