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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
At one high school, the average amount of time tenth-graders spend watching television each week is 21.6 The principal introduces a campaign to encourage the students to watch less television. One y
A production process is set to manufacture bolts with a diameter of 0.5 inches. If production is meeting these standards, and you take a sample and the sample mean is .49 inches, what is the samplin
Show how the standard error was determined. Interpret the confidence interval. Based on these results, explain the distribution of the data.
The mean of the 60 heights is 63.4 in and the mean of the 60 pulse rates is 73.9 beats per minute. Find the best predicted pulse rate of a woman who is 66 inches tall. Use a significance level of a=
When the variances of the population distribution and the sampling distribution of means are compared the
A production process is set to manufacture bolts with a diameter of 0.5 inches. The process has a standard deviation of 0.005 inches. If production is meeting these standards, what is the probabilit
When a population mean is compared to to the mean of all possible sample means of size 25, the two means are
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
A population's distribution is normal with a mean of 20 and a standard deviation of 5. A sample of 16 observations is selected and a sample mean computed. What is the probability that the sample mea
If you wish to estimate a population mean and have estimate be between +/- of the true value and you wish to have a confidence level of 99%., what sample size will be required if the population stan
If a set of grades on a statistics examination is approximately normally distributed with mean of 74 and a standard deviation of 7.9, find the lowest passing grade if the lowest 10% of the students
Check the conditions of inference. Calculate the test statistic, show work. Give the appropriate p-value and state whether it is one-sided or two-sided.
1) A legislative committee consists of 13 democrats, 7 republicans, and 3 independents. A delegation of 3 is selected to attend an environmental summit.