A Company That Sells an Online Course Aimed at Helping

question 123

Multiple Choice

A company that sells an online course aimed at helping high-school students improve their SAT scores has claimed that SAT scores will improve by more than 90 points on average if students successfully complete the course. To test this, a national school counseling organization plans to select a random sample of n = 100 students who have previously taken the SAT test. These students will take the company's course and then retake the SAT test. Assuming that the population standard deviation for improvement in test scores is thought to be 30 points and the level of significance for the hypothesis test is 0.05, find the critical value in terms of improvement in SAT points, which would be needed prior to finding a beta.

• A) Reject the null if SAT improvement is > 95 points.
• B) Reject the null if SAT improvement is < 85.065 points.
• C) Reject the null if SAT improvement is > 95.88 points.
• D) Reject the null if SAT improvement is > 94.935 points.

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Definitions:

Groin/Perineum

The area of the body in both males and females located between the abdomen and the thighs; the perineum specifically refers to the region between the genitals and the anus.

Lemon-Glycerin Sponges

Pre-moistened swabs commonly used in healthcare to moisten and clean the mouth and lips, though not recommended for long-term use as they can dry out oral tissues.

Suction

The process of removing liquids or gases by creating a vacuum, often used in medical procedures to clear airways or surgical sites.

Stomatitis

Inflammation of the mouth and lips, which can cause soreness and may result from various causes, including infection, irritation, or underlying disease.