Mathematics, 09.04.2021 09:30 josh7049
A cognitive psychologist wants to know whether memory performance is changed by old age. She randomly selects 19 elderly individuals and finds that their mean score on a standardized memory test equals 456.2. Scores on the standardized test in the general population are distributed normally with a mean equal to 478.8 and a variance equal to 2352.3 . Is there sufficient evidence to conclude that memory performance for elderly individuals differs from that of the general population? Use a significance level of 0.1 Step 1 of 2 : What is the value of P? Use four decimals in your answer.
Answers: 1
Mathematics, 21.06.2019 16:00
Determine the mean and variance of the random variable with the following probability mass function. f(x)=( 729divided by 91) (1 divided by 9) superscript x baseline comma x equals 1,2,3 round your answers to three decimal places (e.g. 98.765).
Answers: 3
Mathematics, 21.06.2019 19:20
1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?
Answers: 2
A cognitive psychologist wants to know whether memory performance is changed by old age. She randoml...
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