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A psychologist obtains a random sample of 20 mothers in the first trimester of their pregnancy. The mothers are asked to play Mozart in the house at least 30 minutes each day until they give birth. After 5? years, the child is administered an IQ test. It is known that IQs are normally distributed with a mean of 100. If the IQs of the 20 children in the study result in a sample mean of 104.1 and sample standard deviation of 14?, is there evidence that the children have higher? IQs? Use the α=0.10 level of significance.
?(a) Determine the null and alternative hypotheses.
H0?: μ = 100
H1: μ > 100
?(b) Calculate the? P-value.
?P-value =_______
(Round to three decimal places as? needed.)
As a CFO of a publically traded company, suggest how you would create an ethical environment to ensure account balances are correctly valued and reported so that information is reliable for users. Provide support for your rationale.
1. SAT scores are normally distributed. Suppose the mean is 1000 and the standard deviation is 200.
Suppose you are testing H0: μ = 36 versus Ha: μ
The new independent variable improves the predictive power of the regression model.
Find a formula in terms of p for the probability that the number show by the shape is 3 or more.
Compute these probabilities using the binomial formula, or using an online binomial calculator such as those available here or here - How many correct responses does Kayla actually have and Is the setting of adolescents related to their well-being?
At the .01 significance level, is there a difference in the use of the four entrances?
State the hypotheses for a right-tailed test.
when conducting a paired-samples t test we can assess the practical importance of our obtained results by calculatinga.
In a population distribution, a score of X =28 cor- responds to z = 21.00 and a score of X =34 cor- responds to z = 20.50. Find the mean and standard deviation for the population.
The table below summarizes results from an experiment in which subjects were classified as diabetic or nondiabetic and then given a treatment. After the treatment, they were again classified as diabetic or nondiabetic. Which combinations of before..
A political strategists believes that less than 55% of voters in a certain state support a particular issue. He then commission s a poll of 500 voters and 54% of them support this issue. If a = .05, is the political strategist's belief warranted
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