Find a 99% confidence interval for the difference in the mean strengths between threads treated for 60 seconds and those treated for 120 seconds.

In an experiment involving the breaking strength of a certain type of thread used in personal flotation devices, one batch of thread was subjected to a heat treatment for 60 seconds and another batch was treated for 120 seconds. The breaking strengths (in N) of ten threads in each batch were measured. The results were

60 seconds: 43 52 52 58 49 52 41 52 56 54
120 seconds: 59 55 59 66 62 55 57 66 66 51


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Describe the basic operation and components of a centrifugal pump.

What will be an ideal response?

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By 1900, advocates of women's suffrage

A. acknowledged that women were biologically weaker than men but claimed that they deserved the vote anyway. B. had abandoned the effort to persuade western states to grant women the right to vote. C. formed strong alliances with African Americans seeking voting rights. D. argued that the vote would enable women to extend their roles as mothers and homemakers to the public world. E. insisted on the inherent political and moral equality of men and women.

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When working on a job, why should you always try to exceed a client's

expectations?

What will be an ideal response?

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Carry the answer to four decimal places. How much larger is the diameter of number 11 wire than that of number 16 wire?

Fill in the blank(s) with the appropriate word(s).

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