The Typing Speeds (In Words Per Minute)and Reading Speeds (In

The typing speeds (in words per minute) and reading speeds (in words per minute) of nine randomly selected secretaries were recorded.Use the regression analysis and summary statistics provided below to determine a 90% prediction interval for the reading speed of a secretary whose typing speed is 50. $$\begin{array} { l c l l c } \text { Variable } & \text { Count } & \text { Mean } & \text { StdDev } & \text { Range } \\\text { Typing speed } & 9 & 60.44444 & 3.3587 & 35 \\\text { Reading speed } & 9 & 501.8889 & 33.42298 & 297\end{array}$$ Dependent variable is: Reading speed R-squared = 12.385%
S = 100.3348 with 9 - 2 = 7 degrees of freedom $$\begin{array} { l l l l l } \text { Variable } & \text { Coefficient } & \text { SE(Coeff) } & \text { t-ratio } & \text { P-value } \\\text { Constant } & 290.2093 & 215.4116 & 1.347231 & 0.219884 \\\text { Typing speed } & 3.502052 & 3.520579 & 0.994737 & 0.352998\end{array}$$

A) 371.1 to 559.5 words per minute
B) 253.1 to 677.5 words per minute
C) 405.9 to 450.9 words per minute
D) 257.1 to 673.6 words per minute
E) 458.6 to 472.0 words per minute

Correct Answer:

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