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A network engineer is working to improve password strength. If he tells his client that all passwords must contain a combination of numbers (0 - 9) and letters (A - Z). Each password must be a minimum of 6 "characters" long. Reptitions of the numbers and letters permitted - how many different passwords can his client create?
If the null hypothesis is true, then how much difference should be expected, on average, between the two sample means?
The proportion of people aged 18-25 who currently use illicit drugs is equal to 0.20 (or 20%). Now, express the null hypothesis H0 and alternative hypothesis H1 in symbolic form.
Student A and B took different statistics classes and 2 different finals. Student A had a score of 83 out of 100 and ranked 72 in his class. Student b scored 85 out of 100 and he ranked in the 70 percentile of his class.
Hits on a personal web site occur quite infrequently. They occur randomly and independently with an average of five per week.
Bonus is sales are made to 3 of the neighbors, and $200 if he able to sell to 4 neighbors. In how many ways can edwards make bonuses greater than $50?
Find the test statistic, p-value and critical value and state a final conclusion. Sample data: n=40, mean of the values in a sample = 117, assume that the standard deviation = 14 and the significance level = 0.05
Does your analysis change if the term "average" refers to the mean? To the median? Explain what effect this misinformation might have on the perception of the nation's schools.
Two impendent samples of signs 9 and 8 gave the sum of squares of deviation from their respective means as 160 and 91 can the samples be regarded as drawn from the normal population with equal variance
A researcher would like to evaluate the relationship between a person's age and their preference between two leading cola brands.
A federal bank examiner is interest in estimating the mean outstanding defaulted loans balance of all defaulted loans over the last three years. Calculate a 90% confidence interval for the mean balance of defaulted loans over the past three years.
Same survey showed that average length of time each store was in business in 6 years, with standard deviation of 2.5 years. Which is more variable, number of magazines or number of years?
the gre combined scores for students applying to an engineering schools graduate program are normally distributed with
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