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Quarters are currently minted with weights having a mean of 5.670 g and a standard deviation of 0.062g. new equipment is being tested in an attempt to improve quality by reducing variation. a simple random sample of 24 quarters is obtained from thoes manufactured with the new equipment, and this sample has a standard deviation of 0.049g. use the sample results to construct a 95% confidence interval estimate of σ, the standard deviation of the weights of quarters made with the new equipment . based on the confidence interval,does the new equipment appear to produce a standard deviation that is clearly lower than the standard deviation of 0.062 g from the old equipment? based on the results, does the new equipment appears to be effective in reducing the variation of the weights?
A random sample of 10 miniature Tootsie Rolls was taken from a bag. Each piece was weighted on a very accurate scale. The results in grams were:
if you sample 100 people and 20 turn out to be over 65 inches tall, you get $20. Which is better: a sample of size 100 or a sample of size 1,000? Choose one and explain. Does the law of averages relate to the answer you give?
The following sample data shows the quarterly earnings in millions for two US companies. Your research interest is finding if the average earnings for these companies are different.
Of those female students, 85% of them will graduate, whereas 90% of males will successfully complete the same programme. If a new TESL student is chosen at random, what is the probability that: They graduate and they are female?
Two independent samples of sizes n1 = 50 and n2 = 50 are randomly selected from two populations to test the difference between the population means. The sampling distribution of the sample mean difference, is:
In a large western university, 15% of the students are graduate students. If a random sample of 20 students is selected, what is the probability that the sample contains:
As a test the truck company purchases a random sample of metal parts from Steel-R-Us, and then determines if these parts were delivered on-time. Which hypotheses should they test?
Todd is less interested in testing a hypothesis than he is in developing an estimate for what people would be willing to pay. He would like 95% confidence intervals for the average price people would be willing to pay
A genetic experiment with peas resulted in one sample of offspring that consisted of 438 green peas and 159 yellow peas.
Standard deviation of 4 beats per minute. If 300 women are examined, how many would you expect to have a heart rate less than 75?
A sample of students attending Southeast Florida University is asked the number of social activities in which they participated last week. The chart below was prepared from the sample data.
Suppose the assembly times follow normal distribution. Find out z values for 29 and 34 hours. What percent of garages take between 32 hours and 34 hours to erect?
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