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Computing mean, variance for the given discrete distribution:
A random dialing machine with p = 0.15 for each call attempt.
a) What is the expected value and variance for the number of contacts in eight attempts?
b) What is the expected value and variance for 50 attempts?
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
One person's file is chosen at random. Find out probability that selected person will fall into following categories. Book keeping.
A survey of college students collected information on several variables: Distance from Home, Age, Major, Gender, and Class. The variable Major is
In which of the following situations is bootstrapping (and other resampling methods) often used and Which of the following is a valid description of the bootstrapping method.
Gas consumption of 3 cars (labeled car A, car B, and car C) using 4 different kinds of gasoline. Is there difference among kinds of gasoline?
The probabilities of low, medium and high compliance are 0.3, 0.4, and 0.3, respectively
If the basket ball player is a 74% free throw shooter, then, on average, how many free throws will he or she make in a game with eight free throw attempts?
Suppose among 312 large city residents sampled, 65 refused to cooperate. What is the margin of error at the 95% confidence level.
Compute the variance and standard deviation
Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?
Test hypothesis that mean weight of 2 sheets are equal against alternative that they are not(suppose equal variances). Use α=0.05 and suppose equal variances. Determine the P value.
For a t distribution with 16 degrees of freedom, find the area, or probability, in each region.
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