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A poker hand consists of 5 cards chosen randomly from a standard 52 card deck. a) Find the chance that you are dealt a poker hand with exactly 2 aces.
A cell phone service provider has selected a random sample of 20 of its customers in an effort to estimate the mean number of minutes used per day. The results of the sample included a sample mean o
A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size sample should be obtained if he wishes the estimate to be within 3 percentage points with 95% con
Suppose that 13% of all steel shafts produced by a certain process are nonconforming but can be reworked (rather than having to be scrapped). Consider a random sample of 200 shafts, and let X denote
1. A box contains 5 green, 6 red, 2 yellow, and 8 blue marbles. Four marbles are drawn from the box at the same time. a) what is the probability that none of the marbles are green?
The data show the bug chirps per minute at different temperatures. Find the regression equation, letting the first variable be the independent (x) variable. Find the best predicted temperature for a
Conduct the appropriate hypothesis test using a signifigance level equal to 0.05
In a trial of 250 patients who received 10-mg doses of a drug daily, 30 reported headaches as a side effect. A) Obtain a point estimate for the population proportion of patients who received 10-mg d
Construct a confidence interval of the population proportion at the given level of confidence.
A human gene carries a certain disease from a mother to her child with a probability rate of 0.58. That is, there is a 58% chance that the child becomes infected with the disease. Suppose a female c
Elongation measurements are made on 10 pieces of steel, five of which were treated with Method A (aluminum plus calcium) and the remaining five with Method B (aluminum only). It is conjectured that
Houses with and without air conditioners on nine different streets in the certain city are shown below. Test (at the 5% level) the null hypothesis that having an air conditioner is independent of str
A group of students at a school take a history test. The distribution is normal with a mean of 25 and a standard deviation of 4. The top 5% of the scores get to compete in a statewide history contes
The mean of the 80 heights is 63.2 in and the mean of the 80 pulse rates is 73.1 beats per minute. Find the best predicted pulse rate of a woman who is 75 inches tall. Use a significance level of a=
The distribution of the SAT scores in math for an incoming class of business students has mean of 580 and standard deviation of 25. Assume that the scores are normally distributed.
Participants were not told which type of tea they had, and were asked to drink one cup of tea per day for a month. At the end of the month, a psychologist evaluated them to determine if their mood h
The main advantage of experiments over observational studies is that: A well-designed experiment can give good evidence that the treatment actually causes the response.
The economist determined the covariance to be -2.67. The help wanted index had a standard deviation of 5.54. The unemployment rate among insured workers had a standard deviation of 7.05. Find the co
Probability you will win 40 times? What is the most likely number of wins? What is the probability of obtaining the number of wins in d?
A production process is set to manufacture bolts with a diameter of .5 inches. The process has a standard deviation of .005 inches. If production is meeting these standards, what is the probability
Assume a normal distribution with a mean of 70 and a standard deviation of 12. What limits would include the middle 65% of the cases?
Suppose that the probability that a child living in an urban area is the US is obese is 20%. A social worker sees 15 children living in urban areas.
Determine the null and alternative hypotheses. The percentage of viewers tuned to FOX News is equal to 85%.?
The following data give the 1994 total area of farmland (in millions of acres) for 10 states (Statistical Abstract of the United States, 1995). The data, entered in that order, are for the states o