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It is known that 30% of all customers of a major credit card pay their bills in full before any interest charges are incurred. Suppose a simple random sample of 150 credit card holders is selected. What is the probability that between 40 and 50 customers pay their accounts balances in full before any interest charges are incurred?
We wish to compare the average sales in two shops, to see if the population mean of the first one is higher than the second one. One shop had 100 sales averaging $94, with a standard deviation of $40.
armstrong faber produces a standard number-two pencil called ultra-lite. since chuck armstrong started armstrong faber
a professor measures the time x that students take to complete an examination and the score y that the students
A student randomly guesses on all 25 questions of a true-false test. Use the normal approximation to the binomial to approximate Pr[ ], that is, that the student gets 10 or fewer questions correct.
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
let xn1.32 the proportion and find the proportiona. propxlt2.85b. propxgt3c. prop1.33ltxlt5.3d.
assume that you plan to use a significance level of 0.05 to test the claim that p1 p2. use the given sample sizes and
We have discussed two different methods for making statistical inferences such as developing interval estimates and conducting hypothesis tests. These methods are the "Critical Value Method" and the "P-Value Method".
Standard deviation is 250 pounds. if you pull a weight of at least 4200 pounds with this tow chain, what percentage of time would you expect the chain to break.
If you were with the franchisee, would you want the level of significance to be higher or lower? why? if you used the franchisee's level of significance, would your power be higher or lower than before or would it not change?
If several years pass and you want to conduct a new survey to estimate the mean length of time that car owners plan t keep their cars, how many randomly selected car owners must you survey?
Explain the relationship between sample size and the likelihood of a statistically significant difference between the measured values of two groups.
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