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Probability using normal distribution. According to Investment Digest ("Diversification and the Risk/Reward Relationship", Winter 1994, 1-3), the mean of the annual return for common stocks from 1926 to 1992 was 15.4 percent, and the standard deviation of the annual return was 24.5 percent. During the same 67 year time span, the mean of the annual return for long-term government bonds was 5.5%, and the standard deviation was 6.0 percent. The article claims that the distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric. Assume that these distributions are distributed as normal random variables with the means and standard deviations given previously.
1. Find the probability that return for common stocks will be greater than 0 percent.
2. Find the probability that return for common stocks will be less than 20 percent.
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
How much time should the employer allow employees to finish the job? (Round up to the nearest minute).
One approach would be to contact every psychology graduate student you know and ask them to fill out a questionnaire about it.
Would Kruskal-Wallis be the suitable statistical procedure to test this Research Question (RQ)? Describe your answer. When would you use Chi-Square test rather than One-Way Anova?
Conduct the hypothesis test and compute the p-value. At a 0.05 level of significance, what is your conclusion?
A manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 16 minutes. It takes the elevator 1 minute to go from floor to floo..
Assume that the amount your town's population grows every year is fixed or constant. Utilize your equation in part b to approximate the population in the year 2030.
Suppose the likelihood that any flight on Northwest Airlines arrives within 15 minutes of scheduled time is .90. We choose four flights from yesterday for study.
A research analyst regresses the number of calls for service (Y) on the Fahrenheit temperature at 4:00 in the afternoon (X). The regression equation finds: Y = 62 + 2.4 X with an r 2 of .67
What kind of statistical test best did you use?
Decide if the events A and B are mutually exclusive or not mutually exclusive. A card is drawn from standard deck of 52 playing cards.
What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
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