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You have been told that the distribution of regular unleaded gasoline prices over all gas stations in Indiana is normally distributed with mean $3.25 and standard deviation $0.075, and you have been asked to find two dollar values such that 95% of all gas stations charge somewhere between these two values.
Why is each of the following an acceptable answer: between $3.076 and $3.381, or between $3.103 and $3.397?
Can you find any other acceptable answers?
Which of the many possible answers would you give if you are asked to obtain the shortest interval?
Based on responses from 1,015 randomly selected teens, which concluded that 44% of teens say grades are the greatest source of pressure, test the claim that fewer than half of all teens in the population feel that grades are the greatest source of..
The Niko Electronics Company has just manufactured 5000 CDs, and 3% are defective. If 10 of the CDs are selected and tested, what is the probability that the entire batch will be rejected?
Suppose that a failure of certain component follows the distribution f(x) = px(1 - p)x for x = 0, 1, and zero, elsewhere. How many components must one test in order that the sample mean X will lie within 0.4 of the true state of nature with probabili..
What are the relevant variables? What are their measurements (think variation)? If you intend to collect your own data, include a description of your statistical design and sampling plan. If it's a survey, include the questionnaire. If you are usi..
in 1990 the mean ph. level of rain in town was 4.61. a biologist fears the ph. level has recently increased. she draws
assume that you are testing ho p .5 vs. ha p gt .5 and that based on the collected data the p-value of the test is
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
Military radar and missile detection systems are designed to warn a country of enemy attacks. What is the probability that 1 detection system will detect an attack.
Connie's Apparel was one of Flashner's clients. Connie's Apparel made a profit last year. What is the probability that it was given an original rating of poor?
Tamika's savings account has a balance of $4069. If she makes no deposits or withdrawals for 4 years, and the account accrues interest at 5% compounded quarterly, what will be the total amount of money in her savings account at the end of the 4-y..
At the 5% level of significance, is there evidence of a difference among the mean access read times for the three files sizes?
in southern california a growing number of persons pursuing a teaching credential are choosing paid internships over
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