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The mean body mass index (BMI) for boys age 12 is 23.6. an investigator wants to test if the BMI is higher in boys age 12 living in new york city. How many boys are needed to ensure that a two-sided test of hypothesis has 80% power to detect an increase in BMI of 2 units? Assume that the standard deviation in BMI is 5.7.
An investigator wants to design a study to estimate the difference in the mean BMI between boys and girls age 12 living in new york city. How many boys and girls are needed to ensure 95% confidence interval estimate for the difference in mean BMI between boys and girls has a margin of error not exceeding 2 units?
Give a work example and perform a hypothetical 2 population hypothesis test. Create a scenario and do a hypothesis testing example for ANOVA. Give the result and explain what it means.
Would it be reasonable to conclude that the population mean is 63 pounds?
To test the effectiveness of a new studying strategy, a teacher randomly divides a sample of 8 students into tow groups, with n = 4 in each group.
The bank wishes to inform prospective customers that '99 times out 100 we can process your application in q working days'. Assuming that the normal distribution is still an adequate model, calculate q.
It was reported that approximately 45% of all university professors are extroverted. Suppose you have classes with 6 different professors.
Draw the pmf of the Poisson distribution that results when the parameter α is equal to the following:
Determine the probability in big class that both sections are covered? Only one section? Neither section? Determine the expected number of sections covered?
I need to make a perfect positive linear correlation scatter diagram. Could you please outline this procedure so that I can continue to make other scatter diagrams
How many degrees of freedom should the researcher use in her t-test critical value assuming that the variances are equal?
Record the type of research design used. True lab experiment, quasi-experiment, field experiment, or correlation design.
In this forum post provide your results also elucidate what they mean in context of your favorite channel. To find 95 percent confidence interval for given data.
Let the random variable X denote the number of emergency calls received by the campus police office each day. The probability mass function of X is given by:
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