Mathematics, 23.10.2019 03:50, lyndah15
Polymer composite materials have gained popularity because they have high strength to weight ratios and are relatively easy and inexpensive to manufacture. however, their nondegradable nature has prompted development of environmentally friendly composites using natural materials. an article reported that for a sample of 10 specimens with 2% fiber content, the sample mean tensile strength (mpa) was 51.9 and the sample standard deviation was 1.2. suppose the true average strength for 0% fibers (pure cellulose) is known to be 48 mpa. does the data provide compelling evidence for concluding that true average strength for the wsf/cellulose composite exceeds this value? (use α = 0.05.)
Answers: 3
Mathematics, 21.06.2019 18:30, pacerskora
Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared
Answers: 1
Mathematics, 21.06.2019 20:20, bbyjoker
Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?
Answers: 1
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