Mathematics, 30.11.2019 04:50 barstr9146

# Arecent study was conducted to determine the curing efficiency (time to harden) of dental composites (resins for the restoration of damaged teeth) using two different types of lights. independent random samples of lights were obtained and a certain composite was cured for 40 seconds. the depth of each cure (in mm) was measured using a penetrometer. the summary statistics for the halogen light were n_1 = 10, x_1 = 5.35, and s_1 = 0.7. the summary statistics for the luxomax light were n_2 = 10, x_2 = 3.90, and s_2 = 0.8. assume the underlying populations are normal, with equal variances. a. the maker of the halogen light claims that they produce a larger cure depth after 40 seconds than luxomax lights. is there any evidence to support this claim? use alpha = 0.01. b. construct a 99% confidence interval for the difference in population mean cure depths.

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Mathematics, 04.02.2019 19:27

Angel entered a triathlon (a three-part race). he swam 1 mile, rode his bike 30 miles, and ran 10 miles. how far did he go altogether? a. 11 miles b. 123 miles c. 41 miles d. 40 miles

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Mathematics, 04.02.2019 17:38

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

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Mathematics, 04.02.2019 02:22

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

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Mathematics, 02.02.2019 05:16

If you prove that âˆ†wxz is congruent to âˆ†yzx, which general statement best describes what you have proved?

Answers: 3

Arecent study was conducted to determine the curing efficiency (time to harden) of dental composites...

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