According to Consumer Reports, the average monthly flight cancellation rate is 1.8%. The following data show the monthly cancellation rate for 154 months.
The data is provided in the attached file Flight_Statistics.csv
1.What is the sample mean?
2.What is the sample standard deviation?
3.How many degree of freedom?
4.What is the standard error?
5.What is the 99% confidence interval?
6.Do the results from this sample validate Consumer Report’s finding?
7.What is the margin of error with .01 level of significance?
A Reuters/Ipsos online poll randomly selected 2005 adults nationwide, including 1874 registered voters between July 2-6 2016. The registered voters were asked: If the 2016 presidential election were being held today and the candidates were Hillary Clinton, the Democrat, and Donald Trump, the Republican, would you vote for Hillary Clinton or Donald Trump? 819 would vote for Hillary Clinton, 699 for Donald Trump. (You only need the information about registered voters and Hillary Clinton for point estimate and confidence interval)
Are some registered voters undecided or did not answer?
Find a point estimate of the proportion of registered voters that would vote for Hillary Clinton.
What is the standard error?
Find a 98% confidence interval for the proportion likely to vote in the Democratic presidential primary
What is the margin of error with a .02 level of significance, assuming the proportion is not known?