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The psychology department of a large university maintains its own vivarium of rats for research purposes. A recent sampling of 50 rats from the vivarium revealed the following rat weights:
a. Construct a frequency distribution of grouped scores with approximately 11 intervals.
b. Construct a histogram of the frequency distribution constructed in part a.
c. Is the distribution symmetrical or skewed?
d. Construct a stem and leaf diagram with the last digit being a leaf and the first two digits a stem. Do not repeat stem values.
e. Which diagram do you like better, the histogram or the stem and leaf diagram? Why?
It is estimated that such a programme will cost $7 M and that the probability of the flu striking in the next year is 0.75
Calculate the mean, median, and standard deviation and get statistics on the original reaction time, separately for the three stimulus types. Comment on how the means compare for the three stimulus types.
A study was conducted to test the effectiveness of a juggling class. Before the class started, six subjects juggled as many balls as they could at once. After the class, the same six subjects juggled as many balls as they could. The differences in th..
What is the coefficient of correlation"r"? Do you think this "r" value suggests a strong correlation among the predictors ( the independent variables?
Formulate a null and an alternative hypothesis for a two-sided test and conduct the test at the 0.05 level of significance - The problem that demonstrates inference from two dependent samples uses hypothetical data from the TB vaccinations and the n..
Find the average time a plane must wait in line before itcan land.c.Calculate the average time it takes a plane to clear therunway once it has noti?ed the airport that it is in thevicinity and wants to land.d.The FAA has a rule that an air traf..
A marketing analyst in a large grocery store chain
Write the null hypothesis in mathematical form; and in plain English. Write the alternative hypothesis in mathematical form; and in plain English. State the model assumption(s) and assess them.
Firebrick Tire Company wants to increase sales of its long running, low-end Roadmaster Tire brand with anew advertising campaign promoting they will last at least 28,000 miles [Mu=28,000 miles]. Tests with arandom sample [n=30 tires] show a sample m..
What is the largest number of children living in a respondents household - What percentage of respondents who have no children living in their household strongly disagree that schools should teach children to obey authority?
It has been found from past experience that of the articles produced by a factory, 20% come from machine 1, 30% come from machine 2 and 50% come from machine 3. The percentages of satisfactory articles among those produced are 95% for machine 1, 85% ..
4. A simple random sample of 300 items is selected from a large shipment, and testing reveals that 4% of the sampled items are defective. The supplier claims that no more than 2% of the items in the shipment are defective. Carry out an approp..
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