Mathematics, 20.11.2020 16:50 jpimentel2021
Concrete placed on a structure was subsequently cored after 28 days and the following results were obtained of the compressive strengths from five test specimens: 3625, 3750, 3825, 3450 and 4155 psi. Part 1) Determine the 90% two-sided confidence intervals of the mean concrete strength. (Answer correct to 1 decimal places) Lower Limit 3568.2 100% Upper Limit 3953.8 100% Part 2) Suppose the confidence interval established is too wide, and the engineer would like to have a confidence interval +310 psi of the computed sample mean concrete strength. What is the confidence level associated with the specified interval based the five measurements given above?
Answers: 3
Mathematics, 21.06.2019 18:00
Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares
Answers: 1
Mathematics, 21.06.2019 18:00
Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.
Answers: 3
Mathematics, 21.06.2019 19:10
Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?
Answers: 2
Mathematics, 21.06.2019 20:00
Which type of graph would allow us to compare the median number of teeth for mammals and reptiles easily
Answers: 2
Concrete placed on a structure was subsequently cored after 28 days and the following results were o...
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