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A developmental psychologist hypothesized that children who are reared in families where more than one language is spoken will have higher abstract reasoning abilities as adolescents than children reared with just a single language spoken. After obtaining IRB approval through his university, he placed an ad in the local college newspaper asking for parent/child volunteers. Through responses to his ad he was able to recruit 40 children from 12 to 15 years of age, 20 from bilingual families and 20 from monolingual families.He then administered the Wechsler Intelligence Scale for Children (WISC) to all children and focused his analyses on a subscale that assessed abstract reasoning ability. He found that children from bilingual families scored on average 5 percentile points higher on the abstract reasoning subscale than children from monolingual families. This difference was statistically significant at the α=.05 level. What kind of research is this?
A town s January high temperatures average 36° F with a standard deviation of 10°, while in July the mean high temperature 74° is and the standard deviation is 8°. In which month is it more unusual to have a day with a high temperature of 55°? Exp..
Compute the mean of the sampling distribution? Compute the standard deviation of sampling distribution?
The following table gives the cumulative frequency distribution of the commuting time (in minutes) from home to work for a sample of 400 persons selected from a city.
Write the probability density function of this random variable.- What is the probability that the task will be performed in less than 8 minutes? Explain.
There are numerous times when the information collected from a real organization will not conform to the requirements of a parametric analysis.
Show that a heat pump with a coefficient of performance COPh greater than a heat pump that operates on a Carnot cycle would violate Clausius' statement of the second law.
Assume that Los Arboles had a special program in place to encourage helmet use. Elucidate to what extent did removal of the outlier improve the fit.
Starting on January 1, we measure the noontime temperature (in degrees Celsius) at Newark Airport every day for one year. This experiment generates a sequence, C(1),C(2), . . . ,C(365), of temperature measurements.
It is well known that the mean resting heart rate of adults is 71 beats/minute.- At α = .05, is there sufficient evidence to indicate that the true mean heart rate during laughter exceeds 71 beats/minute?
What are the expected value and variance of the following probability distribution?
six second-graders tried tossing a ball into a basket ten times each. their teacher then suggested a different way of
Use a spreadsheet with the data below to find the all-items index numbers listed below for Years 1 and 2 with Year 0 as the base year.
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