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There are 1000 students in the senior class at a certain high school. The high school offers two Advanced Placement math/stat classes to seniors only: AP Calculus and AP Statistics. The roster of the Calculus class shows 95 people; the roster of the Statistics class shows 86 people. There are 43 overachieving seniors on both rosters.
1. What is the probability that a random selected senior is in at least one of the two classes?
2. If the student is in the Statistics class, what is the probabilty the student is also in the Calculus class?
3. A random sample of 225 SAT scores has a mean of 1500. Assume that SAT scores have a population standard deviation of 300. Construct a 95% confidence interval estimate of the mean SAT scores.
Discuss the strengths and weaknesses of correlational and regression studies; discuss concepts such as positive and negative correlations, correlation coefficients, confounding, and causality.
Do you support Bob's claim that citizens in his area spend more than $75 per year? Explain why or why not. Find a 95% confidence interval for the true mean amount that citizens spend per year.
Make (a) a frequency table, (b) a histogram, and (c) a frequency polygon. Then describe the general shape of the distribution.
Iif we want to be 90% confident that the sample percentage is within (+/-) 3 % of the actual percentage of the accidents covered by the insurance company?
suppose a manufactuirng company make a certain item. the time to produce each item is normally distributed around a
Suppose that 15% of all adults jog. An opinion poll asks a simple random sample of 500 adults if they jog. What is the sampling proportion in the sample who jog?
What is the inherent meaning and justification of cross multiplication as it applies to solving an equality? Is | x -2 | the same as | 2 - x |? Please explain your answer. How do you express the following mathematically?
Can you conclude that u1 is not equal to u2 at alpha=.05? State the hypothesis in orders of 1-2. construct a 99% confidence interval for the difference in true means. State the confidence interval in terms of 2-1.
a child types the letters q w e r t y randomly producing 1000 letters in all. what is the expected number of times that
A sample of 500 respondents in a large metropolitan area was selected to study consumer behavior. Among the questions asked was "do you enjoy shopping for clothing?" Of 240 males, 136 answered yes.
Surveys 32 currents students discovering that 12 will return for summer school. b. with a 0.95 probability, how large of a sample would have to be taken to provide a margin of error of 3% or less?
the owner of brittens egg farm wants to estimate the mean number of eggs laid per chicken. a sample of 20 chickens
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