Answering the follow questions using the memorydata.txt. COMPLETED IN R CODE"Subj" "Delay" "Study"...

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Answering the follow questions using the memorydata.txt. COMPLETED IN R CODE

"Subj" "Delay" "Study" "Recall" "1" "1" "delay1" "short" 13 "2" "2" "delay1" "short" 25 "3" "3" "delay1" "short" 17 "4" "4" "delay1" "short" 16 "5" "5" "delay1" "short" 21 "6" "6" "delay1" "short" 19 "7" "7" "delay1" "short" 24 "8" "8" "delay1" "short" 17 "9" "9" "delay1" "short" 21 "10" "10" "delay1" "short" 17 "11" "11" "delay1" "short" 24 "12" "12" "delay1" "short" 17 "13" "13" "delay1" "short" 9 "14" "14" "delay1" "short" 15 "15" "15" "delay1" "short" 18 "16" "16" "delay1" "short" 20 "17" "17" "delay1" "short" 16 "18" "18" "delay1" "short" 18 "19" "19" "delay1" "short" 21 "20" "20" "delay1" "short" 19 "21" "21" "delay1" "short" 17 "22" "22" "delay1" "short" 19 "23" "23" "delay1" "short" 19 "24" "24" "delay1" "short" 15 "25" "25" "delay1" "short" 17 "26" "26" "delay1" "short" 19 "27" "27" "delay1" "short" 19 "28" "1" "delay30" "short" 10 "29" "2" "delay30" "short" 13 "30" "3" "delay30" "short" 16 "31" "4" "delay30" "short" 18 "32" "5" "delay30" "short" 18 "33" "6" "delay30" "short" 7 "34" "7" "delay30" "short" 24 "35" "8" "delay30" "short" 15 "36" "9" "delay30" "short" 18 "37" "10" "delay30" "short" 20 "38" "11" "delay30" "short" 15 "39" "12" "delay30" "short" 11 "40" "13" "delay30" "short" 5 "41" "14" "delay30" "short" 10 "42" "15" "delay30" "short" 23 "43" "16" "delay30" "short" 17 "44" "17" "delay30" "short" 18 "45" "18" "delay30" "short" 24 "46" "19" "delay30" "short" 20 "47" "20" "delay30" "short" 20 "48" "21" "delay30" "short" 18 "49" "22" "delay30" "short" 18 "50" "23" "delay30" "short" 15 "51" "24" "delay30" "short" 8 "52" "25" "delay30" "short" 15 "53" "26" "delay30" "short" 21 "54" "27" "delay30" "short" 25 "55" "1" "delay1" "long" 16 "56" "2" "delay1" "long" 26 "57" "3" "delay1" "long" 18 "58" "4" "delay1" "long" 17 "59" "5" "delay1" "long" 21 "60" "6" "delay1" "long" 19 "61" "7" "delay1" "long" 23 "62" "8" "delay1" "long" 15 "63" "9" "delay1" "long" 17 "64" "10" "delay1" "long" 18 "65" "11" "delay1" "long" 25 "66" "12" "delay1" "long" 19 "67" "13" "delay1" "long" 6 "68" "14" "delay1" "long" 22 "69" "15" "delay1" "long" 21 "70" "16" "delay1" "long" 16 "71" "17" "delay1" "long" 17 "72" "18" "delay1" "long" 25 "73" "19" "delay1" "long" 21 "74" "20" "delay1" "long" 21 "75" "21" "delay1" "long" 15 "76" "22" "delay1" "long" 15 "77" "23" "delay1" "long" 20 "78" "24" "delay1" "long" 18 "79" "25" "delay1" "long" 21 "80" "26" "delay1" "long" 22 "81" "27" "delay1" "long" 21 "82" "1" "delay30" "long" 17 "83" "2" "delay30" "long" 27 "84" "3" "delay30" "long" 18 "85" "4" "delay30" "long" 19 "86" "5" "delay30" "long" 19 "87" "6" "delay30" "long" 23 "88" "7" "delay30" "long" 25 "89" "8" "delay30" "long" 15 "90" "9" "delay30" "long" 27 "91" "10" "delay30" "long" 15 "92" "11" "delay30" "long" 29 "93" "12" "delay30" "long" 20 "94" "13" "delay30" "long" 9 "95" "14" "delay30" "long" 24 "96" "15" "delay30" "long" 22 "97" "16" "delay30" "long" 22 "98" "17" "delay30" "long" 23 "99" "18" "delay30" "long" 22 "100" "19" "delay30" "long" 21 "101" "20" "delay30" "long" 19 "102" "21" "delay30" "long" 21 "103" "22" "delay30" "long" 19 "104" "23" "delay30" "long" 19 "105" "24" "delay30" "long" 19 "106" "25" "delay30" "long" 20 "107" "26" "delay30" "long" 19 "108" "27" "delay30" "long" 20

memorydata-2mlipu5n.txt

Pooja · Accepted Answer

1)
> require("dplyr")
> group_by(memorydata, Delay, Study) %>%
+   summarise(
+     count = n(),
+     mean = mean(Recall, na.rm = TRUE),
+     sd = sd(Recall, na.rm = TRUE)
+   )
# A tibble: 4 x 5
# Groups:   Delay [2]
  Delay   Study count  mean    sd
        
1 delay1  long     27  19.1  4.07
2 delay1  short    27  18.2  3.37
3 delay30 long     27  20.5  4.10
4 delay30 short    27  16.4  5.29
2)
The delay1 and delay30 has mean of 18.65 and 18.43. 
The long study and short study have mean of 19.78 and 17.3. 
> library(psych) 
> describe.by(memorydata$Recall, memorydata$Delay)
 Descriptive statistics by group 
group: delay1
   vars  n  mean   sd median trimmed  mad min max range  skew kurtosis   se
X1    1 54 18.65 3.72     19   18.73 2.97   6  26    20 -0.61     1.51 0.51
------------------------------------------------------------------------------------ 
group: delay30
   vars  n  mean   sd median trimmed  mad min max range  skew kurtosis  se
X1    1 54 18.43 5.13     19    18.7 4.45   5  29    24 -0.53     0.11 0.7
> describe.by(memorydata$Recall, memorydata$Study)
 Descriptive statistics by group 
group: long
   vars  n  mean   sd median trimmed  mad min max range  skew kurtosis   se
X1    1 54 19.78 4.11     20   19.86 2.97   6  29    23 -0.58     1.56 0.

"Subj" "Delay" "Study" "Recall" "1" "1" "delay1" "short" 13 "2" "2" "delay1" "short" 25 "3" "3" "delay1" "short" 17 "4" "4" "delay1" "short" 16 "5" "5" "delay1" "short" 21 "6" "6" "delay1" "short" 19...

Answer To: "Subj" "Delay" "Study" "Recall" "1" "1" "delay1" "short" 13 "2" "2" "delay1" "short" 25 "3" "3"...

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