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An extended-life light bulb claims the bulb has an average life of 12,000 hours, with a standard deviation of 500 hours. If the distribution is bell shaped and symmetrical, what is the approximate percentage of these bulbs that will last?
a. Between 11,000 and 13,000 hours?
b. Over 12,500 hours?
c. Less than 11,000 hours?
d. Between 11,500 and 13,000 hours?
a. Solve using the p value approch. b. Solve using the classical approch.
Jane chooses every 20th person in the campus phone book to call for her interview study. Justin identifies important subgroups in the campus population
Using a significance level of .01 to test this hypothesis, what is your decision rule?
A company produces two products that are processed on two assembly lines. Assembly line 1 has 100 available hours, and assembly line 2 has 42 available hours.
The National Survey of Student Engagement (NSSE) surveys freshmen and seniors about their level of engagement in campus and classroom activities that enhance learning.
Two letters are chosen at random without replacement from word statistical. Determine the probability that both letters are s?
Graph the information using a histogram and a scatter plot in Excel as well. How does seeing the information in a graphical format provide more information?
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
If the writing scores for the population have a standard deviation of σ = 20, does the sample provide enough evidence to conclude that the new composition course has a significant effect?
Suppose 1.5 percent of the antennas on new Nokia cell phones are defective. For a random sample of 200 antennas, find the probability that:
Also, 72 percent of the managers have MBA degrees. Using the probability formulas, find the proportion of employees who either have MBAs or are managers.
Determine the observed p-value for the hypothesis test and interpret this value. What does this mean?
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