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From a sample of 90 people, 30% disagreed with a statement.
a) Construct a 95% confidence interval for the proportion of people agreeing with the statement.
b) Construct a 95% confidence interval for the proportion of people disagreeing with the statement.
c) Compare the lengths of the confidence intervals in parts a) and b).
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
A contingency table has 5 rows and 4 columns. How many degrees of freedom are there?
Now make a scatter plot of data from 1982 to 1998 (again, use years since 1800). Determine a linear, power, or exponential model that explains the crude oil production during this time period.
Carry out F test for significance of straight line regression of Y on X and interpret your results.
When making the histogram from frequency table, (a) what goes along the bottom, (b) what goes along the left edge, and (c) what goes above each value?
Solve the mean and standard deviation equations
Number of miles flown in a One- year period by the sample of "frequent flyers" was recorded. Is this a grouped or an ungrouped frequency distribution?
Suppose event A and event B are mutually exclusive with the P(A)=12 and P(B)=1/3.Which of the following statements best describes these two events?
Identify the sampling distribution to be used: the standard normal distribution or the Student's t distribution. Find the critical value(s).
You know that all sociology majors study 2.5 hours per day with a standard deviation of 1.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be
To test whether the population mean is less than a specified value.
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