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Listed below are birth weights (in kilograms) of male babies born to mothers on a special vitamin supplement (based on data from the New York State Department of Health). Test the claim that this sample comes from a population with a standard deviation equal to 0.470 kg, which is the standard deviation for male birth weights in general. Use a 0.05 significance level. Does the vitamin supplement appear to affect the variation among birth weights?
3.73 4.37 3.73 4.33 3.39 3.68 4.68 3.52
3.02 4.09 2.47 4.13 4.47 3.22 3.43 2.54
Find the statistics needed to perform a Chi Square test on the data.
Perform the Chi Square test indicated in the problem. Be certain to use the significance level ? = 0.05. Your test must include hypotheses, work with statistics and a conclusion.
Write a brief statement regarding the last question in the problem.
A question has these possible choices - excellent, very good, good, fair, and unsatisfactory. How many degrees of freedom are there using the goodness-of-fit test to the sample results?
The statewide incidence of gonorrhea is 50 per 100,000 over a 3 month period. Is the number of gonorrhea cases in this county unusual for this time period?
A university found that 20 percent of its students withdraw without completing the introductory statistics. Assume that 20 students registered for the course.
Draw the standard normal distribution, label the axis, locate both z-scores on the axis (z7 = -1.5, z15 = 2.5), and shade an area equal to the probability that a randomly chosen croaker fish will be b/t 7 and 15 inches.
Write a sentence showing how the outcome of the hypothesis test and the measure of effect size would appear in a research report.
Do 1-sample t-test to see if people in Chicago have travelled to fewer states than people nationwide. Utilize the 10% (.10) level of significance.
An article contained the following observations on degree of polymerization for paper specimens for which viscosity times concentration fell in a certain middle range.
Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it represents this level: rankings of the top ten best-selling authors
Thermometers are normally distributed with a mean of O Celsius and a standard deviation of 1. OO Celsius, Find the probability that a randomly selected thermometer reads between - 2.23 and - 1.25 and draw a sketch of the region. The probability is..
A vertical line is drawn through a normal distribution at z = -0.25, and separates the distribution into two sections. What proportion of the distribution is in the larger section?
A standard die has its faces painted different colors. Faces3,4,6 are red, faces 2 and 5 are black and face 1 is white.
A random sample of 500 participants was recruited for the study ? Subjects were allowed to elect to participate in an 3-month exercise program or serve as a control subject (190 chose the program, 310 chose to serve as controls)?
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