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Question 1: There are 25 people in a room. What is the probability that at least two have the same birthday?
Question 2: Consider a game that consists of rolling a regular die. You pay $10 to play the game and the $10 is not returned. If you roll a 1 or 2, you win nothing. If you roll a 3, 4, or 5, you win $8; if you roll a 6 you win $20. What is your expected value for this game?
sample mean = 3.5, standard deviation = 0.9. Use 98% confidence interval to evaluate difference in mean weekly deposits into IRAs for each bank.
Average electric use was studied.a previously known population standard deviation was 450KWH. a sample of 81 houses was studied and found to have a mean of 1858 KWH. Find the 95% confidence interval for the true mean.
How large a sample should be tested in order to be 99% confident that the true proportion of inedible fish is estimated to within 7%? Use 2.575 as the critical value for a 99% confidence interval.
The January 17, 1994 issue of Time magazine reported that 58% of adult Americans said yes to the question "If you or your spouse were pregnant, would you want the unborn child tested for genetic defects?"
Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of � 0.03 grams with 90 percent confidence?
To test the null hypothesis that the mean waist size for males under 40 years equals 34 inches versus the hypothesis that the mean differs from 34, the following data were collected: 33, 33, 30, 34, 34, 40, 35, 35, 32, 38, 34, 32, 35, 32, 32, 34, 36,..
If a group is chosen from a population on the basis of sharing the same percentages of trait features as known to exist in the population, then the group so chosen would constitute:
Is the dealer's mean significantly greater than the national average of 30,000 miles for 2-year leased vehicles, using the 10 percent level of significance?
The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will be between $7000 and $7500?
Compare the standard deviation for the heights of males and the standard deviation for the heights of females in the class.
A random sample of 100 voters found that 44% were goint to vote for a certain candidate. Find the 99% limit for the population proportion of voters who will vote for that candidate.
Scores ranged from 0 to 40 with higher scores reflecting greater computer anxiety. This variable was measured on the interval scale. The researcher analyzed the data using what t test?
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