Mathematics, 10.05.2021 20:50 jocejay83681
Ilya's bank issued an advertisement saying that 90%90\%90%90, percent of its customers are satisfied with the bank’s services. Since he himself wasn't very satisfied, he suspected the ad is false. He surveyed a random sample of 80808080 of the bank’s customers, and found that only 85%85\%85%85, percent were satisfied.
Let's test the hypothesis that the actual percentage of satisfied customers is 90%90\%90%90, percent versus the alternative that the actual percentage is lower than that.
The table below sums up the results of 1000100010001000 simulations, each simulating a sample of 80808080 customers, assuming there are 90%90\%90%90, percent satisfied customers.
According to the simulations, what is the probability of getting a sample with 85%85\%85%85, percent satisfied customers or less
Answers: 3
Mathematics, 21.06.2019 22:00, BeautyxQueen
What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?
Answers: 1
Mathematics, 21.06.2019 22:10, ansonferns983
Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.
Answers: 1
Ilya's bank issued an advertisement saying that 90%90\%90%90, percent of its customers are satisfied...
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