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To test whether extracurricular activity is a good predictor of college success, a college administrator records whether students participated in extracurricular activities during high school and their subsequent college freshman GPA.
ExtracurricularActivity CollegeFreshmanGPA
Yes 3.51Yes 3.37Yes 3.96Yes 3.72No 3.00No 3.83No 3.45No 2.78No 3.85No 2.83
(a) Code the dichotomous variable and then compute a point-biserial correlation coefficient. (Round your answer to three decimal places.)
(b) Using a two-tailed test at a 0.05 level of significance, state the decision to retain or reject the null hypothesis. Hint: You must first convert r to a t-statistic.
Retain the null hypothesis.
Reject the null hypothesis.
A sample of 19 albino Hungarian banded aardvarks was examined for nose length. Since this is a small sample, how various degrees of freedom will be used to find the t-score.
Translate the following arguments into symbolic form.- Either mosquito genes can be cloned or mosquitoes will become resistant to all insecticides and the incidence of encephalitis will increase.
A survey of 500 non-fatal accidents showed that 226 involved the use of a cell phone. Construct a 99% confidence interval for the proportion of fatal accidents that involved the use of a cell phone.
For time-invariant systems, show that (A, B) is controllable if and only if (-A, B) is controllable. Is this true for time-varying systems?
In a regression model with one independent variable X, the intercept or constant (b0) represents the - When an explanatory variable is dropped from a multiple regression model, R2 can increase.
The weight of corn chips dispensed into a 12-ounce bag by the dispensing machine has been identified as possessing a normal distribution with a mean.
What item/s can be deleted to improve reliability, what items should never be deleted to maintain reliability of data and how many items need to be deleted to achieve maximum reliability
What sort of conclusion did Kent Pekel come to in his discussion of integrity and ethics at the CIA? What are his recommendations?
the amount of paint required to paint a surface with an area of 50 m2 is normally distributed with mean 6 l and
a random sample of size 64 is to be used to test the null hypothesis that for a certain age group the mean score on an
A cutting operation. A machine tool in your plant is cutting an outside diameter. A sample of 4 pieces is taken near the end of each hour of production. Table 27.7
Every card is drawn independently with all three cards having equal probability. They continue to take turns until somebody wins. Calculate the probability of Alice winning, the probability of Bob winning, and the probability of Claire winning.
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