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Ages of College Students The dean of students wants to see whether there is a significant difference in ages of resident students and commuting students. She selects a sample of 50 students from each group. The ages are shown here. At a 0.05, decide if there is enough evidence to reject the claim of no difference in the ages of the two groups. Use the standard deviations from the samples and the P-value method.
22 25 27 23 26 28 26 2425 20 26 24 27 26 18 1918 30 26 18 18 19 32 2319 19 18 29 19 22 18 2226 19 19 21 23 18 20 1822 21 19 21 21 22 18 2019 23
Commuter students18 20 19 18 22 25 24 3523 18 23 22 28 25 20 2426 30 22 22 22 21 18 2019 26 35 19 19 18 19 3229 23 21 19 36 27 27 2020 21 18 19 23 20 19 1920 25
The population mean annual salary for first year faculty at SLU is $47,000. Assuming that the population standard deviation is $1800:
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
If many samples of size 1000 persons are chosen, determine the expected value (mean X-bar) or average of average IQ's for these samples?
What is the mean of this uniform distribution? What is the standard deviation?
Assume the probability that a person has the desease is 0.08 for all people, independently of each other. Compute the total expected number of tests necessary.
A manufacturer claims that the life span of its tires is 51,000 miles. Assuming the manufacturer's claim is correct, what is the probability the mean of the sample is 50767 miles or less?
A researcher is looking at the relationship between home-schooling and achievement. She is hypothesizing that the home-schooled children will score higher than non home-schooled children on a standardized achievement test.
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
Length of smoking time was recorded for each. Mean was =140 hours. Suppose = 8 hours. Determine 95% confidence interval for mean amount of time grocery-store ham is smoked.
They decide to sample some fast-food restaurants currently operating to estimate the monthly cost of electricity. They want to be 90% confident of their results and want the error of the interval estimate to be no more than $100.
Finnish Furniture manufactures tables in facilities located in three cities- Reno, Denver, and Pittsburgh. The tables are then shipped to three retail stores located in Phoenix, Cleveland, and Chicago.
Identify a real-life example or application of either the binomial or Poisson distribution. Specify how the conditions for that distribution are met.
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