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Q1) Researcher forecasts that listening to music while solving math problems will make particular brain area more active. To test this, research participant has her brain scanned during listening to music and solving math problems and brain area of interest has percent signal change of 58. From many earlier studies with this same math-problems procedure (but not listening to music), it is known that signal change in this brain area is normally distributed with mean of 35 and standard deviation of 10. By using .01 level, what must researcher conclude? Solve this problem explicitly by using all five steps of hypothesis testing and demonstrate your answer with sketch showing comparison distribution. Then describe your answer to someone who has never taken a statistic course (but who is familiar with mean, standard of deviation and Z scores).
Determine a 95 % confidence interval for the iron concentration.
When combining probabilities, to find the probability of one event AND another event, the separate probabilities should be
The Pearson Product-Moment Correlation Coefficient (r) is a measure of linear relationship between two variables.
An experiment is designed using three levels of ground clutter and two filter types. The experiment is performed by randomly selecting a treatment combination
Compute SS, variance, and standard deviation for following population of N = 7.Scores: 8, 1, 4, 3, 5, 3, and 4. The definitional formula works well with these scores. Use the definitional formula to compute SS.
At a large department store, the amount a shopper spent and the shopper's gender (male or female) were recorded. To determine if gender is useful in explaining the amount of money a shopper spends at the store we could
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
Which of the following(s) can be considered (a) variable(s)?
The null hypothesis is that the distribution of mother's educational level is the same for both treatment groups. The value of the chi-square statistic is 7.422. Evaluate the P-value
At the .05 significance level, can we conclude that the guideline is still reasonable?
Suppose you were to cut up the directory and pull out one listing at random to contact.
Formulate the hypotheses that can be used to determine whether union membership increased in 2006.
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