import pandas as pd
import numpy as np
from scipy.stats import norm
#from scipy.stats import t

data1 = pd.read_csv("http://kanggc.iptime.org/book/data/chap10-2.csv")
data1

var1 = data1['var1']
data1.describe()

print("Data Frame of data1 is : ",f'\n{data1}\n')
print("Summary Statistics of data1 is : ", f'\n{data1.describe()}\n')

xbar = np.mean(var1)
z = norm.ppf(0.975, 0,1)

lcl1 = xbar - z*(0.6/np.sqrt(35))
ucl1 = xbar + z*(0.6/np.sqrt(35))

print("The z value is :", z)
print("The Lower Confidence Limit is :", lcl1)
print("The Upper Confidence Limit is :", ucl1)