How do you perform a one-tailed test for mean IQ scores of this year's class compare to that of previous years?
Not what you're looking for?
A college professor claims that the entering class this year appears to be smarter than entering classes from previous years. He tests a random sample of 14 of this year's entering students and finds that their mean IQ score is 116, with standard deviation of 12. The college records indicate that the mean IQ score for entering students from previous years is 110. If we assume that the IQ scores of this year's entering class are normally distributed, is there enough evidence to conclude, at the .1 level of significance, that the mean IQ score of this year's class is greater than that of previous years?
Perform a one-tailed test. Then fill in the table below.
Carry your intermediate computations to at least three decimal places and round your answers as specified in the table. (If necessary, consult a list of formulas.)
1 null hypothesis?
2. alternative hypothesis?
3. type of test t z chi f
4. Value of test statistic
5.p value
6. can we conclude the mean IQ of this year is greater than previous years
Purchase this Solution
Solution Summary
This solution shows how to conduct a hypothesis test for the situation described in an attached Word document.
Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency
Tests knowledge of the three main measures of central tendency, including some simple calculation questions.
Measures of Central Tendency
This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.
Terms and Definitions for Statistics
This quiz covers basic terms and definitions of statistics.
Know Your Statistical Concepts
Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.