Past experience has indicated that the breaking strength of yarn used in manufacturing drapery material is normally distributed and that σ = 3 psi. A random sample of 10 specimens is tested, and the average breaking strength is found to be 94 psi. Find a 95% two-sided confidence interval on the true mean breaking strength. Round the answers to 1 decimal place

95% Confidence interval:  (92.1,95.9)

Step-by-step explanation:

We are given the following in the question:

Sample mean, = 94 psi

Sample size, n = 10

Alpha, α = 0.05

Population standard deviation, σ = 3 psi

95% Confidence interval:

Putting the values, we get,

(92.1,95.9) is the required 95% confidence interval on the true mean breaking strength.

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15

step-by-step explanation:

we are given the following expression and we are to solve it and find the product:

-13 × (-5)

solving the given expression in the standard order of solving a mathematical expression, beginning with the opening of brackets and then multiplying the terms and changing their signs.

-3 × -5 = 15 (answer is positive because when negative is multiplied with negative, it gives a positive answer)