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The United States Postal Service report 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six letters are randomly sent to different locations.
a. What is the probability that all six arrive within two days?
b. What is the probability that exactly five arrive within two days?
c. Find the mean number of letters that will arrive in two days.
d. Compute the variance and standard deviation of the number that will arrive within two days.
Compute the sample variance and the sample standard deviation for these data (to 2 decimals).
Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times?
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
Do these data suggest a statistically significance difference between the proportions of drug-resistant cases in the two states? Use a 0.02 level of significance and computed value of 2.37.
By using the normal probability distribution, what is the probability the car will be repaired in 35 minutes or less?
At the .05 significance level, can we conclude that the guideline is still reasonable?
Compute and interpret each of the statistics in parts(a) through (f) Mean and Median.
CASE STUDY: Are the Fish Safe to Eat? Assessing which Factors affect Mercury Levels in Fish in Maine Lakes.
Standard deviations for first- and second-time and confidence interval
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
Let A be the event that a randomly chosen employee has a college degree and B the event that the chosen employee's income is more than $50,000.
At.01 significance level, can we conclude that there is more variation in selling prices of oceanfront homes?
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