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People in a large population average 60 inches tall. You will take a random sample and will be given a dollar for each person in your sample who is over 65 inches tall. For example if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size of 1,000? Choose one and explain. Does the law of average relate to the answer you give?
What is the difference between strong negative and strong positive correlation? What does zero correlation tell you? Can you share a relationship between two variables that is typically negative?
Based on a study of heights of men and women who do gymnastics, a researcher concludes that the exercise from playing gymnastics causes people to become shorter. Do you agree with this conclusion?
A sample of 49 provides a sample mean of 38 and a sample standard deviation of 7. Determine the standard error of the mean.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. What is the lower limit of the 90% confidence intervel? What is the upper limit of the 90% confidence interval?
The price of XYZ Corporation stock is normally distributed all through the year with mean of $42.00 per share and a standard deviation of $2.25 per share. Suppose that the stock is traded 240 days out of the year.
The probability that home sales will increase in the next 6 months is 0.25. The probability that the interest rates on loans will go up in the same period is estimated to be 0.74.
Can you please help me develop a research question using gender and another categorical variable associated to adhd that could be address using the chi-square method?
The dealership would now like some general information based on the entire sample of vehicles. Calculate and explain the following:
A shoe salesman want to see if his female customers have a preference in the color of shoe purchased. What is the test value for the following data?
Differentiate between a point estimate and an interval estimate for a population parameter. What is necessary for an interval estimate to be a confidence interval?
Suggest one psychological research question that could be answered by each of the following types of statistical tests:
Show that Pearson's Chi-square statistic for testing Ho : 1 = 2 when there are k-categories reduces to Z^2 when k = 2, where Z = 2 sqrt(n)(p1-1/2) is the standard Z-test for testing Ho : 1 = 1=2
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