Please show working 

A quality analyst measures the number of hours a patient in a low-risk condition waits for care at the emergency room of a small hospital. The following data are obtained for 20 patients. 

2.26 2.01 3.0 1.22 1.92 1.79 0.78 1.89 0.71 1.58 
2.02 2.77 2.87 0.51 0.74 1.95 2.76 2.61 3.54 2.95 

a. compute the sample mean, sample median, and range of data. 
b. compute the sample standard deviation and sample variance. 

Question 3 
Since careful records have begun being kept in January, Eric’s small business 
has delivered the following quantities of flowers throughout town. 


January 
February 
March 
April 
May 
June 
July 
August 
Small 
Bouquets 
85 
34 
26 
24 
43 
29 
30 
19 
LargeI. 
Bouquets 
23 
64 
27 
18 
33 
23 
20 
13 
Assuming the data is normally distributed, construct two separate 90% confidence intervals, one for the number of deliveries of small bouquets in September and one for the number of large bouquets in 
September. 
Question 4 
Consider the following data values of variables x and y 
x: 5 4 3 6 9 8 10 
y: 7 8 10 5 2 3 1 
Construct a scatter diagram of the data points and plot the least squares regression line on it. Find the least squares regression line.