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Suppose 4-year-olds in a certain country average3hours a day unsupervised and that most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is1.8hours and the amount of time spent alone is normally distributed. We randomly survey one 4-year-old living in a rural area. We are interested in the amount of time the child spends alone per day.
What percent of the children spend over 10 hours per day unsupervised? (Round your answer to four decimal places.)
Many kinds of games people play rely on randomness. Cite three different methods commonly used in the attempt to achieve this randomness, and discuss the effectiveness of each.
For a simple random sam- ple of 20 bottles of toner, the average was 1535 pages, with a standard deviation of 30 pages. Making and stating whatever assumptions you believe are necessary, con- struct and interpret the 95% confidence interval for th..
All the pupils took the same achievement test, and the means for groups receiving different methods were compared. What was the dependent variable?
both james and fred brought in a can of chicken noodle soup for lunch. james can of soup has a diameter of 5 inches and
(a) What is the estimated percentile for a student who scores 705 on Critical Reading? (b) What is the approximate score for a student who is at the 34th percentile for Critical Reading?
medical researches claim that the mean body temperature is not equal 98.6 degrees f for healthy adults. temperatures
Set up a scatter diagram. Use the least-squares method to find the regression coefficients and State the regression equation.
weakly earnings on a certain import venture are approximately normally distributed with a known mean of 219 and unknown
7.5 Refer to Table 2.10 on death penalty verdicts. Let D = defendant's race, V = victim's race, and P = death penalty verdict. Table 7.20 shows output for fitting model (DV,DP,PV ). Estimates equal 0 at the second category for any variable.
Suppose that a random sample of 120 house owners reveals that the average ownership period until the property is sold was 7.2 years and the standard deviation was 3.5 years.- Conduct a two-tailed hypothesis test using α = 0.05 and state your conclu..
Contracts for two construction jobs are randomly assigned to one or more of three firms, A, B, and C. Let Y1 denote the number of contracts assigned to firm A and Y2 the number of contracts assigned to firm B. Recall that each firm can receive 0, ..
1.we are establishing a quality control program for a process and need to establish the mean and standard deviation for
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