1) Clairol maintains that more than 72% of women in the US use some type of hair coloring on their hair. You work with a local beauty shop and find that of 100 women who come into the shop, 70% of them use hair color. At a 0.05 level of significance, is Clairol's assertion supported.
Is this a left, right or two tail test?
What is the calculated value of z?
Convert z to a P-value?
Do you reject or fail to reject the null hypothesis?