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British scientists have developed a 15 minute brain scan they hope could be used to detect autism in children. Autism and related disorders affect up to 7 out of every 1000 individuals. The brain scan method was 90% accurate in correctly identifying the autistic patients.It also showed a negative result for healthy controls in 80% of cases. If a child tested positive for autism,what is the probability that he indeed has autism?
Pick the option CLOSEST TO THE ANSWER:
(a) 0.9 (b) 0.7 (c) 0.5 (d) 0.3 (e) 0.1
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
Determine the values of mean M and standard deviation s for original sample?
An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
If it is determined that there is no difference between the population mean being represented by the sample and the mean of the population at large, then:
X is a normally distributed random variable with mean 10 and variance 24. a. Find P(X bigger 14) b. find P(8 smaller X smaller 20)
An old saying in golf is "you drive for show and you putt for dough." The point is that good putting is more important than long driving for shooting low scores and hence winning money.
At the .05 significance level, can we conclude that there is a difference in their mean times?
If the agency is risk neutral, use a decision tree to determine its best course of action.
Suppose that this is a simple random sample of adult residents of Maine.
Describe each of the following methods of statistical inference in detail (Please try to use layman's terms).
Set up dummy coded dummy variables to contrast each of the other groups to Group 2, medium Anxiety; run a regression to predict exam performance (Y) from these dummy coded dummy variables.
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals. He calculated t = 1.9 from his data.
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