Mathematics, 24.12.2019 04:31 amberskids2
Astudy investigated whether regular mammograms resulted in fewer deaths from breast cancer over a period of 20 years. among 30,615 women who never had mammograms, 186 died of breast cancer, while only 147 of 30,139 who had undergone screening died of breast cancer. a. do these results suggest that mammograms may be an effective screening tool to reduce breast cancer deaths? b. if your conclusion is incorrect, which type of error did you commit? let p_1 be the proportion of deaths for women who had never had a mammogram and p_2 be the proportion of deaths for women who had undergone screening. choose the correct null and alternative hypotheses below. a. h0: p1-p2=0 ha: p1-p2> 0 b. h0: p1-p2=0 h0: p1-p2≠0c. h0: p1-p2≠0 ha: p1-p2=0d. h0: p1-p2> 0 ha: p1-p2< 0i. determine the test statistic. ii. find the p-value. what is the result of this hypothesis test with a level of significance of 0.1? a. do not reject the null hypothesis because there is not sufficient evidence to support the claim that screening reduces the proportion of deaths. b. do not reject the null hypothesis because there is sufficient evidence to support the claim that screening reduces the proportion of deaths. c. reject the null hypothesis because there is sufficient evidence to support the claim that screening reduces the proportion of deaths. d. reject the null hypothesis because there is not sufficient evidence to support the claim that screening reduces the proportion of deaths.
Answers: 3
Mathematics, 21.06.2019 14:30, brockandersin
Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?
Answers: 3
Mathematics, 21.06.2019 20:30, wednesdayA
Evaluate the expression for the given value of the variable. | ? 4 b ? 8 | + ? ? ? 1 ? b 2 ? ? + 2 b 3 -4b-8+-1-b2+2b3 ; b = ? 2 b=-2
Answers: 2
Mathematics, 21.06.2019 22:20, guesswhoitis21
Line segment eg is partitioned by point f in the ratio 1: 1. point e is at e (0, 4), and point f is at (1, 3). what are the coordinates of point g? (−1, 5) (2, 2) (3, 1) (4, 0)
Answers: 2
Astudy investigated whether regular mammograms resulted in fewer deaths from breast cancer over a pe...
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