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A. Identification of Levels of Measurement
In your study group, identify the levels of measurement (nominal, ordinal, interval, or ratio) as well as type of variable (categorical or quantitative) for each of the following:
B. Relative Frequency Table for a Quantitative Variable...
A gas station manager recorded the amount of gasoline car owners bought during a one hour time period on a Friday afternoon. The frequency distribution below shows the distribution for amount of gasoline (in gallons) purchased:
Amount of Gasoline (in Gallons) Frequency Relative Frequency
0.0-2.9 2
3.0-5.9 8
6.0-8.9 .15
9.0-11.9 5
12.0-14.9
Total 20
1. Complete the above table, with frequencies and relative frequencies
2. What percentage of gasoline purchases were at least 9 gallons? Please show how you obtain the answer.
To have 95% confidence that the sample percentage will be within 3 percentage points of the actual population percentage, how large a simple random sample is required?
The mean number of cups was 5 with a standard deviation of 1.5 cups. The distribution was normal. What proportion of students drank 7 or more cups of coffee per day?
Calculate the probability that there will be 2 or fewer accidents during (i) 1 week, (ii) 2 weeks; (iii) calculate the probability that there will be 2 or fewer
A state representative is reported as saying that about 10% of reported auto thefts involve owners whose cars have not really been stolen, but who are trying to defraud their insurance company.
Find a printed article using data that are subject to a bias that could have a dra~ marie effect on the conclusions reached in the article.
Qualitative or ethnographic research uses open-ended questions that attempt to nuance the distinctions that quantitative research attempts do to numerically.
Arrivals at a telephone booth are considered to be poison, with an average time of 10 minutes between successive arrivals. The length of a phone call is distributes exponentially with mean3 minutes. The probability that an arrival does not have to..
imagine that there are 100 different researchers each studying the sleeping habits of college freshmen. each researcher
If the desired value for m is 2.5 inches, formulate the appropriate testing hypothesis problem and carry out the test if a = 0.05.
Simple! (Takes about 25 minutes to answer.) In a study evaluating "Why minority males graduate American high-schools at lower rates than their counterparts", the following is needed:
Remember that a confounding variable affects the response variable and is related to the explanatory variable. For each of the following situations.
find the critical values for the indicated test for a population variance sample size n and the level of significance
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