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Suppose a simple random sample of size 43 is selected from a population with o = 12. Find the value of the standard of the error of the mean in each of the following cases (use the finite population correction factor if appropriate.
a. The population size is infinite (to 2 decimals). b. The population size is N = 50,000 (to decimals). c. The population size N = 5000 (to 2 decimals). d. The population size N = 500 (to 2 decimals).
In the study of 15 taxi drivers, average experience was 11.2 years. Standard deviation was 2. At α = .10, is number of years' experience of taxi drivers really less than taxi company claimed?
A sample of 25 their average life from the time they are fully charges to the time they are fully discharged is 170 minutes the sample standard deviation is 30 minutes. Test the claim that battery will last for three hours.
A multiple-choice examination consists of 90 questions, each having possible choices a, b, c, d, and e. Approximate the probability that a student will get at least 21 answers correct if she randomly guesses at each answer.
For any distribution the score that separates the highest 10% from the rest of scores is called.
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
If statistically significant, do you think the difference is large enough to be important?
Determine the test criteria that would be used to test Ho: u 1.0 with n=18 and significance level of 0.01 using the classical approach.
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes.
What is the probability that there will be more than 6 accidents in a 1-hour period? What is the probability that there will be at most 2 accidents during the 2-hour busy period on a particular day?
From the shipment you take a random sample of 20. When sampling with replacement (binomial), determine the probability of obtaining: Exactly two defective components in the sample of 20.
Determine the value of correlation coefficient between these 2 variables?
Consider a charity organizations that receives random donations. Assume the donations to arrive following a Poisson process with a rate of one donation per hour in average. What is the probability that it will not be able to make the payment?
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