# Homework Help: Null Hypothesis/Alternative hypothesis, statistics help

1. Jul 17, 2011

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Null Hypothesis/Alternative hypothesis, statistics help!!

1. The problem statement, all variables and given/known data
For each of the following questions, state(using symbols) the null and alternative hypotheses.
a.)Does the average speed of vehicles on the Thruway exceed 65?
b.) Is the mean height of 6th graders different from 50 inches?
c.) Is the mean IQ of a sample of 60 children significantly below the national average of 100?
d.) In January, does the average daily high temperature exceed 30 degrees?
e.) Is the proportion of males enrolled at the college more than that expected by chance?

2. Relevant equations
(work shown below)

3. The attempt at a solution
a.) Average speed >/= 65
Average speed </= 65
b.) The mean height of 6th graders is not different from 50 inches.
The mean height of 6th graders is different from 50 inches.
c.) The mean IQ of a sample of 60 children is not significantly below the national average of 100.
The mean IQ of a sample of 60 children is significantly below the national average of 100.
d.) In January, the average daily high temperature does not exceed 30 degrees.
In January, the average daily high temperature does exceed 30 degrees.
e.) The proportion of males enrolled at the college is not more than that expected by chance.
The proportion of males enrolled at the college is more than that expected by chance.

(I NEED HELP ALSO KNOWING WHETHER TO USE Ho : p or Ho:(micro symbol)