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Nature Deficit Only a few generations ago, children played much more outside, participated in spontaneous play, communicated face to face, and learned how to compromise. Today, in fear, many parents are reluctant to let their child play outdoors alone. As a result, many children have very little contact with nature. Some research suggests that children who play regularly in natural environments tend to be healthier. A random sample of middle school children was obtained, and the number of hours per week each child played outside and the number of days of school missed due to illness was recorded. The data are given in the following table.
Compute Spearman's rank correlation coefficient. Does this value support the theory that healthier children spend more time outside? Justify your answer.
Suppose you play a game at a casino where your probability of winning each game is 0.49. On each game, you bet $10, which you either win or lose.
For reservation purposes, the agency's management wants to find the number of people such that the probability is 0.85 that at least that many people will sign up.
Formulate a hypothesis statement for the following claim: "The average adult drinks 1.7 cups of coffee per day." A sample of 35 adults drank an average of 1.95 cups per day. Assume the population standard deviation is 0.5 cups. Using α = 0.10, tes..
find and interpret the 98 confidence interval for the standard deviation of the time that it takes a telephone
Referencing Exercise, how might you operationalize the amount of fruit and vegetable items purchased on a trip to the store as a(n).
Write a MATLAB program to estimate this probability through Monte Carlo simulation techniques.- provide the estimate of the desired probability.
In a sample of n=60 people who recently received speeding tickets, 38 were older than 25 years and the other 22 were age 25 or younger. Is the age distribution for this sample significantly different from the distribution for the population of li..
Is there evidence of difference in median performance between two methods? (Use α = 0.05.)
Assume a random sample of 16 gasoline stations is selected and their mean cost for regular gasoline is computed. What is the standard error of the mean in this experiment?
Let X1, ... , Xn be i.i.d. r.v.'s with (?nite) unknown mean m and (?nite) known variance s 2, and suppose thatn is large. i) Use the CLT to construct a con?dence interval for m with approximate con?dence coef?cient 1 - a;
at a large local hospital 20 teen volunteers worked a total of 172 hours with a standard deviation of 3.6. thirty
A sample data set has n=50 observations. The mean of the data is x=46.5. the sum of squares is x^2=127793. What is the standard deviation of the data.
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