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Question 1: The average teacher's salary in Arizona is $42,300 with standard deviation $5000. Assuming a normal distribution, what is the probability that the mean of a sample of 50 teachers' salaries will be at least $48,000 a year?
Question 2: If a baseball player's batting average is 0.275, find the probability that the player will get at least 40 hits in 100 times at bat.
Question 3: Thirty randomly selected vehicles were stopped, and the tread depth of the right front tire was measured. The mean was 0.20 inch, and the standard deviation was 0.05 inch. Find the 95% confidence interval of the mean depth. Assume the variable is approximately normally distributed.
Question 4: A statistics instructor is asked to estimate the average age of students at the college at 99% confidence with accuracy within 2 years. A previous study determined that the standard deviation was 5 years. How large a sample is needed?
When using SPSS to perform a 2 independent sample t-test, the P-Value was .136...with alpha set to .05. I have to decide to accept or reject the null hypothesis.
If there are 12 business-class passengers and 50 tourist-class passengers on a particular flight, what are the expected value of total luggage weight and the standard deviation of the total luggage weight?
Scores by women on the SAT-I test are normally distributed with a mean score of 998 and a standard deviation of 202. scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6 assume the two tests ..
Critically discuss the Central Limit Theorem? How large should the sample size be if the underlying distribution of the population values are:
If one person is selected at random from these young ones, find the probability that this person is employed given that the person is male.
A random sample of 95 printers discovered that 20 of them were being used in small businesses. Find the 95% limit for the population proportion of printers that are used in small businesses.
From these we calculate = 129.44; = 122.65; sx = 9.15; sy = 11.02. Perform the test H0: against the alternative H1:, using the two sample t-test, and state any assumptions you may require to do this test.
Perform a paired-samples t-test for experiment (p = .01 or 99% confidence, two-tailed). Is there a significant difference between the two teaching methods?
sampling and the binomial distribution.nbspfollowing is a gender frequency distribution for students in professor
Using a significance level of 0.05, perform a hypothesis test to see if the workers are right, and you need to hire more help. Write your hypotheses, calculate your test statistic and decide whether or not to reject your null.
There were 23 people at my last Arachnophobics (fear of spiders) Anonymous' Halloween party. As a gag fake spiders were put into the gift boxes to be handed out when people came in.
A) Determine the probability that at least 4 of the 155 golfers would get a hole in one on the sixth hole. Discuss
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