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The following data was collected in a survey of 8th graders and summarize their cell phone status.
No Cell Phone Conventional Cell Phone user Smart Phone user Total
Boys 55 65 35 155
Girls 31 78 27 136
Total 86 143 62 291
What proportion of the 8th graders have conventional cell phones?
consider a data set in which all observations are equal. find the range variance and standard deviation for this data
A cognitive psychologist measures the reaction times of 6 subjects to emotionally laden words.- Compute the Mean, Median, Mode, Range, Standard deviation, and Variance cognitive.
Based on the information in (a), find a one-sided lower 90% confidence limit for m. Also, find a one-sided upper 90% confidence limit for m.
The Social Services Safety Net Is Fraying" reported in March 2005 on the growing problem of waiting lists for mental retardation services in a certain state
The probabilities of the events A and B are .20 and .30, respectively. The probability that both A and B occur is .15.
Refer to the previous exercise. PROC LOGISTIC in SAS reports AIC values of 642.1 for the model with the four main effects and the six interaction terms, 637.5 for the model with only the four binary main effect terms, 644.0 for the model with only..
Use a one-tailed hypothesis test with an alpha level of .01 to demonstrate. Calculate the estimated r squared, the percentage of variance accounted for, to measure the size of this effect.
find the indicated quantities given that x is a normal random variable with a mean of 30 and a standard deviation of
Is there any evidence to suggest that the proportion of children with asthma who are exposed to second-hand smoke is greater than the proportion for children without asthma? Use a = 0.01.
A die has half of the faces red and the other half black. The die is rolled 3 times. Let the random variable X represent the number of black outcomes out of three rolls. What is P(1) that is the probability if exactly one black outcome out of three r..
Based on given exercise and the previous two, which of the three ways of thinking is most effective for communicating the results? Give reasons for your answer.
Consider a radar set of a type whose failure law is exponential. If radar sets of this type have a failure rate ? = 1 set/WOO hours, find a length T of time
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