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Q1) To evaluate the true mean weight of packages received by parcel service, 39 packages are arbitrarily chosen and weighed. Sample has mean weight of 15.3 pounds and standard deviation of 1.9 pounds. Construct a 95% confidence interval estimate for true mean weight of all packages received by parcel service.
Q2) Sociologist develops the test to measure attitudes about public transportation, and 27 arbitrarily chosen subjects are given test. Their mean score is 76.2 and their standard deviation is 21.4. Create the 90% confidence interval for mean score of all such subjects. You may suppose scores are usually distributed.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
What is the probability that no more than two of the three are commercial successes?
If the estimate is to be within 8 mpg of the true mean with 98% confidence and the estimated standard deviation is 22 mph, how large a sample size must be taken?
Find the probability that a randomly selected employee earns less than $5.43.
Find the expected GPA when SAT = 800. Find E (GPA|SAT = 1,400). Comment on the difference.
An experiment was performed to investigate lifetime of a component exposed to high heat. Three different oven types were used at either 550°F or 600°F.
MATH1550H: Assignment: Question: A word is selected at random from the following poem of Persian poet and mathematician Omar Khayyam (1048-1131), translated by English poet Edward Fitzgerald (1808-1883). Find the expected value of the length of th..
Research question: Are mean crash damages same for these 3 vehicles? Crash1 Crash Damage ($).
Table shows the smoking habits of group college students. If student is selected at random, determine the probability of getting someone who is man or a woman.
At the .05 significance level, can she conclude that there is a difference in the mean amount of weight loss among the three diets?
Use a scatter plot to determine the relationship between the x values and the y values.
Questions based on binomial distribution, variance of the binomial distribution, discrete random variable and continuous random variables.
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