Mathematics, 19.12.2019 22:31 ack12
Georgianna claims that in a small city renowned for its music school, the average child takes at least 5 years of piano lessons. we have a random sample of 20 children from the city, with a mean of 4.6 years of piano lessons and a standard deviation of 2.2 years. what is the 90% confidence interval for the average number of years students take piano lessons in this city?
Answers: 3
Mathematics, 21.06.2019 19:00
65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?
Answers: 1
Mathematics, 21.06.2019 19:30
What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4
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Mathematics, 21.06.2019 19:50
Prove (a) cosh2(x) − sinh2(x) = 1 and (b) 1 − tanh 2(x) = sech 2(x). solution (a) cosh2(x) − sinh2(x) = ex + e−x 2 2 − 2 = e2x + 2 + e−2x 4 − = 4 = . (b) we start with the identity proved in part (a): cosh2(x) − sinh2(x) = 1. if we divide both sides by cosh2(x), we get 1 − sinh2(x) cosh2(x) = 1 or 1 − tanh 2(x) = .
Answers: 3
Mathematics, 22.06.2019 00:40
Which linear function represents the line given by the point-slope equation y + 1 = –3(x – 5)?
Answers: 1
Georgianna claims that in a small city renowned for its music school, the average child takes at lea...
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