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An investigator reviewed 700 singleton birth records from the past 5 years at St. Catharines General Hospital. A total of 56 records were identified as low birth weight infants (birth weight less than 2500 grams). She also identified another 56 infants whose birth weight were higher than 2500 grams, but who were born the same day and matched with the same gender as in the low birth weight group. Each infant's mother was interviewed to determine whether cigarette smoking exposure was associated with fetal birth weight.
a) What type of study is this? This is a retrospective study.
b) How many factors (variables) are involved in this study? What are they? (Not sure how to determine an answer for this kind of question, explanation would be very helpful)
c) What are the measurement scales for these factors (variables)? (Once again, not too sure how to identify whether variable are nominal, ordinal, interval, or ratio)
Your program is destroyed when a printer jams. What is the probability that printer A is involved? printer B is involved? printer C is involved?
A dependent samples t test is typically more powerful than an independent samples t test because? Reduces participant/subject variability between groups.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
How much greater is the percent of senior citizens who attend a play at least once per year than the percent of people in their twenties who do so?
a population of 200 voters contains 78 republicans 120 democrats and 2 independents and members of other parties. a
1.you decide to test a friend for esp using a standard deck of 52 playing cards. such a deck contains 13 spades 13
Explain the effect outliers can have on the analysis of the center of this data set. Based on the box-plot and histogram you created for problem 1, do there appear to be any outliers?
A random sample of 25 tablets of buffered aspirin contains, on average 325.05 mg of aspirin per tablet, with a standard deviation of 0.5 mg. find the 95% tolerance limits that will contain 90% of the tablet contents for this brand of buffered aspi..
There will be no significant differences in high school teacher efficacy among mathematics, science, and English teachers.
Suppose a pair of dice is rolled. Let X be the total number of spots which turn up. Roll the pair an additional X times.
A sample of n = 16 scores is selected from a population with µ = 60 and s = 24. If the sample mean is M = 66, what is the z-score for this sample mean?
Problem: Three sets of measurement are in the table below.
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