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The following sample data shows the quarterly earnings in millions for two US companies. Your research interest is finding if the average earnings for these companies are different. Justify your answer by doing a five step testing of the hypothesis at the 0.05-level of significance. Show all the steps of the calculations.
Company 1......Company 2
17.8......................18.01
18.........................17.75
17.98.......................18
18.2......................17.77
18.00....................18.01
17.99....................18.01
18.1......................18.12
17.9......................18.2
Test hypothesis that calories of two populations are equal. Illustrate all steps of the hypothesis testing process. Points will be deducted for missing parts.
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
What is the stock's value at it's highest on 15 days of the year? (Assume that there are 240 trading days in a year).
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 12 hours, with a standard deviation of 3.0 hours.
Bay area community college (BACC) has collected data comparing the starting salaries of their graduating students with last names beginning with the letters A through M with those whose last names begin with N through Z.
Suppose that 30% of the population has black hair. In a randomly-selected group of six people, how probable is it that
For a standard normal curve, find the z-score that separates the bottom 90% from the top 10%.
Ten prominent citizens have been nominated for a community's "Citizen of the Year" award. First- and second-place trophies are awarded to the two persons receiving the highest and second-highest number of votes.
Fifty rounds of a new type of ammunition was fired from a M-1, and the muzzle velocity of the projectile was measured. The sample had a mean velocity of 853 meters per second, with a standard deviation of 2.9 meters per second
Some IQ tests are standardized to normal model with mean of 100 and the standard deviation of 16. Draw a model for these IQ scores, clearly label it , showing what the 65-95-99.7 rule predicts about the score.
A random sample of 1001 University of California faculty members taken in December 1995 was asked, "Do you favor or oppose using race, religion, sex, color, ethnicity or national origin as a criterion for admission to the University of California?
Accident records given by an insurance company give the following information. The probability that an insured driver has an accident is 0.15. If an accident occurs, the damage to the vehicle amount to 20% of its market value 80% of the time
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