STATE: The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 2525 right‑handed students to turn a knob (with their right hands) that moved an indicator by screw action. There were two identical instruments, one with a right‑hand thread (the knob turns clockwise) and the other with a left‑hand thread (the knob turns counterclockwise). Each of the 2525 students used both instruments. The table gives the times in seconds each subject took to move the indicator a fixed distance. SOLVE: Calculate the mean ?¯x¯ and standard deviation, ?s. (Enter your answer rounded to three decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.) x= ___________ s= ___________ Calculate the ?t‑statistic. (Enter your answer rounded to two decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.) t= ____________ Find the degrees of freedom, dfdf . (Enter your answer as a whole number. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.) df= ___________ What is the ?P‑value. (Enter your answer rounded to four decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.) P= _____________
STATE: The design of controls and instruments affects how easily people can use them. A student project investigated this effect by asking 2525 right‑handed students to turn a knob (with their right hands) that moved an indicator by screw action. There were two identical instruments, one with a right‑hand thread (the knob turns clockwise) and the other with a left‑hand thread (the knob turns counterclockwise). Each of the 2525 students used both instruments. The table gives the times in seconds each subject took to move the indicator a fixed distance.
SOLVE: Calculate the mean ?¯x¯ and standard deviation, ?s. (Enter your answer rounded to three decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.)
x= ___________
s= ___________
Calculate the ?t‑statistic. (Enter your answer rounded to two decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.)
t= ____________
Find the degrees of freedom, dfdf . (Enter your answer as a whole number. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.)
df= ___________
What is the ?P‑value. (Enter your answer rounded to four decimal places. If you are using CrunchIt, adjust the default precision under Preferences as necessary. See the instructional video on how to adjust precision settings.)
P= _____________
FULL DATA SET LINKED HERE: http://crunchit3.bfwpub.com/bps8e?dataset=ex20-49.txt
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