The amount of shaft wear (.0001 in.) after a fixed mileage was determined for each of n = 8 internal combustion engines having copper lead as a bearing material, resulting in a sample mean of 3.72 and s = 1.25. assuming that the distribution of shaft wear is normal with mean μ, use the appropriate test at level .05 to test h0 : μ = 3.50 versus hα : μ > 3.50. state any assumption you have made if necessary.

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

Amanager recorded the number of bicycles sold by his company each quarter. his projected sales after t years is given by the expression below. which of the following statements best describes the expression? a. the initial sales of 575 bicycles increases at the rate of 4% over 4 quarters. b. the initial sales of 575 bicycles increases at the rate of 18% over 4 years. c. the initial sales of 575 bicycles increases at the rate of 4% over t quarters. d. the initial sales of 575 bicycles increases at the rate of 18% over t years.

Write numerical coefficient of y² in the expression 2x² - 15xy – 7y²