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A researcher investigated the effect of volume of background noise on participants' accuracy rates while performing a difficult task. He tested three groups of randomly selected students and obtained the following means and sums of
squares:
Low Volume Moderate Volume High Volume
X 61.5 65.5 48.25
n 4 5 7
Source Sum of Squares df Mean Square F
Between groups 652.16 _____ _____ _____
Within groups 612.75 _____ _____
Total 1264.92 _____
(a) Complete the ANOVA.
(b) At _ 5 .05, what is Fcrit?
(c) Report the statistical results in the proper format.
(d) Perform the appropriate post hoc tests.
(e) What do you conclude about this study?
(f) Compute the effect size and interpret it.
Extrapolating this data by using the sum of squares method would further reveal any discretionary variances in relationship to the mean?
Determine the coefficient of correlation and the coefficient of determination. please show your calculations. Interpret the results.
if independent random samples of size n1n28 come from normal populations having the same variance what is the
Based on the boxplots in part (a), which of the two groups, students or teachers, tends to have watch times that are closer to the true time? explain you choice.
suppose a manufacturing company makes a certain item. the time to produce each item is normally distributed around a
A researcher determines that 42.7% of all downtown office buildings have ventilation problems. Is this a statistic or a parameter; explain your answer.
in the united states the year each coin was minted is printed on the coin. to find the age of a coin simply substract
If one investment can give you $1200 with a probability of .20 and you could lose $800 with a probability of .80, and another investment can give you $600 with a probability of .70 and a loss of $300 with a probability of .30, which investment is ..
A standard deviation of $20, obtain the probability that a monthly landline phone bill for a household is less than $100.
With what degree of confidance can we state that the average weekly salary for all teachers in this area is between $487 and /4517.
Compute the appropriate Test Statistic to test null hypothesis that mean of population is 4.3 against alternative hypothesis μ ≠ 4.3.
Given the following data, calculate the EMV for each investment alternative. Which is best based on the EMVs you calculated?
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