Mathematics, 18.08.2021 01:20, musa79

According to Chemical Engineering an important property of fiber is its water absorbency. The average percent absorbency of 25 randomly selected pieces of cotton fiber was found to be 20 with a standard deviation of 1.5. A random sample of 25 pieces of acetate yielded an average percent of 12 with a standard deviation of 1.25. Is there strong evidence that the population mean percent absorbency for cotton fiber is significantly higher than the mean for acetate? Assume that the percent absorbency is approximately normally distributed and ISyE 3770: Homework Nine that the population variances in percent absorbency for the two fibers are the same. Use a significance level of 0.05.
A. Calculate the test statistic
B. Should we reject the null hypothesis?

Answers: 2

Show answers

Other questions on the subject: Mathematics

Mathematics, 21.06.2019 18:30, daniel1480

Given: m∠ adb = m∠cdb ad ≅ dc prove: m∠ bac = m∠bca lol

Answers: 2

continue

Mathematics, 21.06.2019 22:00, Jasten

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Answers: 1

continue

Mathematics, 21.06.2019 23:00, hello137348474747

Astore sells 4 apples for $3 and 3 oranges for $4 if pete buys 12 apples and 12 oranges how much will it cost

Answers: 1

continue

Mathematics, 21.06.2019 23:00, arnold2619

How many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.) how many 3-digit numbers can you write using only digits 1 and 7? (of course, digits can repeat.)

Answers: 2

continue

Do you know the correct answer?

According to Chemical Engineering an important property of fiber is its water absorbency. The averag...