The Following Data Show the Results from an Independent-Measures Study

question 19

Essay

The following data show the results from an independent-measures study comparing two treatments.
a. Compute the independent-measures t statistic for these data.
b. Compute the percentage of variance explained by the treatment effect (r²).
b.)​Treatment $$\begin{array} { l l } \mathrm { I } & \mathrm { II } \\1 & 6 \\6 & 13 \\6 & 12 \\3 & 9 \\\hline \mathrm { M } = 4 & \mathrm { M } = 10 \\\mathrm { SS } = 18 & \mathrm { SS } = 30\end{array}$$
c. Convert the data into a form suitable for calculating the point-biserial correlation, and compute the correlation. (You should find that squaring the point-biserial correlation will produce the same r² value that you obtained in part

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Definitions:

Share Of Customer

A measure of the quantity of purchase dollars each customer spends on the company’s products.

Market Share

The portion of a market controlled by a particular company or product, often expressed as a percentage of total sales in that market.

Mechanical

Pertaining to machines or the laws of physics that govern how machines work and are utilized.

Direct Customer Interaction

The direct communication and engagement between a business and its customers without intermediaries.