Physicians’ Reactions (PR) case study 27.(PR) What is the mean expected time spe
ID: 3299542 • Letter: P
Question
Physicians’ Reactions (PR) case study
27.(PR) What is the mean expected time spent for the average-weight patients?
What is the mean expected time spent for the overweight patients?
28.(PR) What is the difference in means between the groups? By approximately
how many standard deviations do the means differ?
Descriptions of Variables
Variable
Description
Patient weight
1 = average weight, 2 = overweight
Time
represents how long the doctors said they would spend with the patient
WEIGHT Time
Variable
Description
Patient weight
1 = average weight, 2 = overweight
Time
represents how long the doctors said they would spend with the patient
Explanation / Answer
We can do this quickly in the open source statistical package R , the complete R snippet is as follows
# read the data into R dataframe
data.df<- read.csv("C:\Users\586645\Downloads\Chegg\weighttime.csv",header=TRUE)
str(data.df)
data.df$WEIGHT <- as.factor(data.df$WEIGHT)
## mean of the 2 groups
tapply(data.df$TIME,data.df$WEIGHT, mean)
The means for the 2 groups are
1 2
31.36364 24.73684
## difference in the means is thus 31.36 - 24.73 = 6.63
## sd of the whole data for time is
sd(data.df$TIME)
[1] 10.23762
so number of standard deviations is
6.63/10.23 = 0.64