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The mean and standard deviation of the sample data of 500 students who took a statistics test were 69 and 7, respectively. The grades have a bell-shaped distribution. Based on this information, which one of the following is the best estimate of the number of students with grades between 55 and 83?
The Speedy Oil Change Company advertised a 15-minute wait for an oil change. A sample of 23 oil changes showed a mean time of 16.5 minutes and a standard deviation of 4.3 minutes.
The major shopping areas in community of Springdale include Springdale Mall, West Mall, and downtown area on Main Street. A telephone survey has been conducted to determine strengths and weaknesses of these areas and to find out how they fit in th..
You have been asked to analyse Grand Plomp Ltd, a maker of rocket widgets used by NASA. The owners are wondering whether the return received is sufficient to justify the risks taken in each division.
How large random sample of potential voters will be required to evaluate result with 95% confidence and with margin of error of plus and minus 3%?
The owner of a fish market has an assistant who has determined that the weights of catfish are normally distributed, with a mean of 3.2 pounds and a standard deviaition of 0.8 pound.
What is the probability that all 3 would iPods from best buy? Or at least one would have iPod from best buy?
Four brands of lightbulbs are being considered for use in the final assembly area of the Saturn plant in Spring Hill, Tennessee. The director of purchasing asked for samples of 100 from each manufacturer.
Discuss examples where you would use test of hypothesis at your personal or professional life, in your education or society for the following situations:
If the answer cannot be calculated, enter zero (0) as your answer. Round to 4 decimal places otherwise. YES, you need, therefore, to look at the 5th decimal place.
Determine the value of population mean? What is the best evaluate of this value?
At the .05 significance level, is there a difference in gas mileage for the different types of gas? Write out your null and alternative hypotheses for the problem and state what the finding means practically.
Find a formula for the linear function described. The function, y=f(x), where f(c)=k, f(c+h)=3k and the graph of f(x) goes through the origin.
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