A 90 confidence nmerval for the percentage of airline reserv

A 90% confidence nmerval for the percentage of airline reservations being canceled on the day of the fight is (4 8%, 1 2%) What s the point estimate of the percentage of ofarine eservations be ng canceled on the day of the fight is (4.8%, 112%).Whatsthe point estimate of the percentage of reservations that are canceled on the 075% *80% 085% 090% QUESTION9 As the degrees of freedom for tdistribution approaches infinity, the value of o 1645 o 1.96 o 1.0 1 points Save will approach QUESTION 10 1 points Save Am A95% coefidence interval for the mean age of people with dabetes s to be fond Asa ple of 14 staen tom a deviation is 20.35 What is the lower imit of the confidence with dabetes is to be found A sample of 14 is t taken trom a population that s normally distributed. The mean of this sample is 54 93 and the sample standad o 4427 O 65.6 o 43.18 o 66 68 5 6

Solution

1) Point estimate is average of both end point of interval = 8

2) As df approaches infinity, t value at infinity =1

(As upto infty, total prob =1)

3) n = 14

x bar = 54.93 and s = 20.35

Std error = 20.35/rt 14

= 5.439

Margin of error for 95% = 1.96(5.439)

= 10.6600

Lower limit = 54.93 -10.66

= 44.27