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Question: 1. Can the values of B and calculated for the same population data have different signs? Explain.
2. For a sample data set, the linear correlation coefficient r has a positive value. Which of the following is true about the slope b of the regression line estimated for the same sample data?
a. The value of b will be positive.
b. The value of b will be negative.
c. The value of b can be positive or negative.
Find the probability that, out of the 6 people chosen, exactly 5 people use a tax preparer. Find the probability that, out of the 6 people chosen, 4 or 5 people use a tax preparer.
What are the variables and units in this regression?- What units does the slope have?- Do you think the slope is positive or negative? Explain.
If the card selection is without replacement, what is the probability that the first card is an ace and the second card is also an ace? (Express the answer in simplest fraction form)
Which of these variables could be considered to be a nominal variable? Explain.- Which of these variables is most clearly an ordinal variable? Explain.
Tossing a thumbtack. Toss a thumbtack on a hard surface 100 times. How many times did it land with the point up?
find the numerical value of the following factors using a interpolation b the formula and c a spreadsheet function.1.
In a prospective study, Data collected extensive information on incidence of coronary heart disease (CHD) among smoker and non-smoker individuals.
Draw the histogram for these data using an initial class boundary of and a class width. Note that you can add or remove classes from the figure. Label each class with its endpoints.
1.an srs of 20 third grade children is selected in chicago and each is given a test to measure their reading ability.
for the data set below if you were to fit a regression equation what would the value of r2 be to two decimals? hint
The reason why we finish our calculation by dividing range by 4 is that in most data sets 95% of the data values fall within two standard deviations of the mean.
What is the probability that a randomly selected Oriental rug will have pile height between 8.5 and 9.5 mm?- Find a value h such that 90% of all Oriental rugs have pile height less than h.
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