Scores on an IQ test are normally distributed. A sample of 25 IQ scores had standard deviation =s8. The developer of the test claims that the population standard deviation is =22 Do these data provide sufficient evidence to contradict this claim? Use the = 0.10 level of significance.

1. State the null and alternate hypotheses.
2. Choose a significance level and find the critical value.
3. Compute the test statistic.
4. Determine whether to reject H0
5. State a conclusion.