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Switch	Backplate	Keyboard	KeysPressed
RD	NBP	1	21.27
EC	NBP	1	23.61
FAF	NBP	1	24.04
LMS	NBP	1	21.18
RD	PBP	1	23.98
EC	PBP	1	22.88
FAF	PBP	1	22.37
LMS	PBP	1	22.76
RD	ABP	1	33.46
EC	ABP	1	31.32
FAF	ABP	1	31.32
LMS	ABP	1	32.66
RD	SBP	1	24.57
EC	SBP	1	25.71
FAF	SBP	1	26.24
LMS	SBP	1	24.71
RD	NBP	2	21.11
EC	NBP	2	23.15
FAF	NBP	2	23.24
LMS	NBP	2	23.63
RD	PBP	2	24.06
EC	PBP	2	22.07
FAF	PBP	2	23.29
LMS	PBP	2	22.48
RD	ABP	2	32.96
EC	ABP	2	31.03
FAF	ABP	2	32.58
LMS	ABP	2	31.99
RD	SBP	2	25.74
EC	SBP	2	28.13
FAF	SBP	2	25.42
LMS	SBP	2	24.02
RD	NBP	3	21.96
EC	NBP	3	21.54
FAF	NBP	3	23.16
LMS	NBP	3	22.38
RD	PBP	3	23.64
EC	PBP	3	23.31
FAF	PBP	3	22.29
LMS	PBP	3	23.02
RD	ABP	3	32.87
EC	ABP	3	32.5
FAF	ABP	3	32.03
LMS	ABP	3	32.64
RD	SBP	3	26.04
EC	SBP	3	26.53
FAF	SBP	3	22.91
LMS	SBP	3	25.8

A keyboard manufacturer is assessing the durability of keyboard designs for it's new line of gaming keyboards, the RGB Proking Deluxe (Over 16 trillion colours and 32 different lighting effects!). They are testing out 4 different keyswitch options, rubber dome (RD), electro-capacitive (EC), foam and foil (FAF) and linear mechanical red switches (LMS) along with 4 different backplate options, no backplate (NBP), plastic backplate (PBP), aluminum backplate (ABP) and steel backplate (SBP). Three prototype keyboards of each pair of options were built and tested using typing robots which pressed the keys until failure. The number of keys pressed until failure on each unit were recorded (in millions) and are given below in the following csv file. The company is assuming there is no interaction between backplate and keyswitch type. If you can't use the csv download button for whatever reason, the data is given at the bottom of this page. Use R to anwser the following questions and fill in the two way ANOVA table. Download csv Source DF SS MS F Switch Type Backplate Error Total What is the grand mean of the data? (1 pt(s)] Sabri Tries 0/3 Suppose you want to find the cell means for the backplates. Assuming you've read the keyboard data into the variable keydat, and you want to put the means into a variable called bpmeans which of the following R lines would do that? Incorrect bpmeans 0.25 [1 pt(s)] Sabri Tries 0/1 Calculate the F statistic for backplate type [1 pt(s)] SA Tries 0/3 Pick the interval the p value lies in p-values 0.001 0.001 0.25 (1 pt(s)] Tries 0/1 Suppose now that backplate is no longer considered a factor and switch type is the only factor with 12 replicates. Compute the values needed to fill in the blanks. Source DF SSMS Switch Type Error Total Compute the value of the Error degrees of freedom [1 pt(s)] Sub Tries 0/1 Compute the Error sum of squares [1 pt(s)] Sabri Tries 0/3 Calculate the value of MSE (1 pt(s)] Sa Tries 0/3 Compute the factor (switch type) F-statistic [1 pt(s)] Serie A Tries 0/3 Pick the interval the p value lies in P-value s 0.001 0.001 0.25 [1 pt(s)] A keyboard manufacturer is assessing the durability of keyboard designs for it's new line of gaming keyboards, the RGB Proking Deluxe (Over 16 trillion colours and 32 different lighting effects!). They are testing out 4 different keyswitch options, rubber dome (RD), electro-capacitive (EC), foam and foil (FAF) and linear mechanical red switches (LMS) along with 4 different backplate options, no backplate (NBP), plastic backplate (PBP), aluminum backplate (ABP) and steel backplate (SBP). Three prototype keyboards of each pair of options were built and tested using typing robots which pressed the keys until failure. The number of keys pressed until failure on each unit were recorded (in millions) and are given below in the following csv file. The company is assuming there is no interaction between backplate and keyswitch type. If you can't use the csv download button for whatever reason, the data is given at the bottom of this page. Use R to anwser the following questions and fill in the two way ANOVA table. Download csv Source DF SS MS F Switch Type Backplate Error Total What is the grand mean of the data? (1 pt(s)] Sabri Tries 0/3 Suppose you want to find the cell means for the backplates. Assuming you've read the keyboard data into the variable keydat, and you want to put the means into a variable called bpmeans which of the following R lines would do that? Incorrect bpmeans 0.25 [1 pt(s)] Sabri Tries 0/1 Calculate the F statistic for backplate type [1 pt(s)] SA Tries 0/3 Pick the interval the p value lies in p-values 0.001 0.001 0.25 (1 pt(s)] Tries 0/1 Suppose now that backplate is no longer considered a factor and switch type is the only factor with 12 replicates. Compute the values needed to fill in the blanks. Source DF SSMS Switch Type Error Total Compute the value of the Error degrees of freedom [1 pt(s)] Sub Tries 0/1 Compute the Error sum of squares [1 pt(s)] Sabri Tries 0/3 Calculate the value of MSE (1 pt(s)] Sa Tries 0/3 Compute the factor (switch type) F-statistic [1 pt(s)] Serie A Tries 0/3 Pick the interval the p value lies in P-value s 0.001 0.001 0.25 [1 pt(s)]

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