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1. A principal at a large elementary school (grades 1 - 5) is considering making changes to the bus schedule. She wants to use stratified sampling to determine the potential impact of the proposed changes. Advise the principal on how the desired sample might be drawn. Your response must clearly identify the "stratas" you propose to use and the rationale for your choice of stratas.
2. In your own words, explain the difference between correlation and causation. Provide your own example to illustrate that correlation is not the same as causation. (Answers copied from the text will not receive credit)
3. In your own words, describe the difference between a discrete and continuous variable. Give an example of each type of variable.
4. In your own words, explain the meaning of the term "resistant" by comparing the properties of the mean and the median. Give a simple example to illustrate your point. (Examples copied from the book will not receive credit)
5. An ice-cream shop claims that the mean weight of one scoop of ice-cream is 50 grams. A sample of 100 scoops was found to have the mean of 48.2 grams. A test was made of H0:μ=50,H1:μ<50 and the null hypothesis was NOT rejected. In a letter to the shop owner you need to state your conclusion in "plain language". You may use numbers in your statement, but you may not use technical jargon (e.g. null hypothesis). Write your conclusion below.
What is the average distance that the worker needs to walk to the retrieval location (including units)?
If the school hopes to estimate the true proportion among all its students with 90% confidence and a margin of error of ±4%, how many students must be surveyed?
What happens to the confidence interval if you (a) increase the confidence level, (b) increase the sample size, or (c) increase the margin of error?
researchers measured the seated systolic blood pressure of 27healthy white males. the resulting publication reports x
SAT I scores around the nation tend to have a mean scale score around 500, a standard deviation of about 100 points and are approximately normally distributed. A person who scores (a perfect) 800 on the SAT I has approximately what percentile rank..
Does the value 97.2% suggest that this is a good model? Explain.- Here's a scatterplot of the residuals. Now do you think this is a good model for these data? Explain?
Out of the 109 males, 42% preferred Pepsi and out of the 53 females, 40% preferred Pepsi. Pepsi wanted to test to determine if the males preferred Pepsi more than females.
a sample of 20 items provides a sample standard deviation of 5. compute the 95 confidence interval estimate of the
on a standard iq test the standard deviation if 15. how many random iq scores must be otained if we want to find the
If X = 75, S = 24, and n = 36, and assuming that the population is normally distributed, construct a 95% confidence interval estimate for the population mean, µ.
Scientist decided to do a study on the population growth of rabbits. Inside a controlled environment, 1000 rabbits were placed - how many rabbits would be there
A research study will measure the cost of the new method over a sample production period. Develop the null and alternative hypothesis most appropriate for this study.
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