The Marcus High School Marching Band has approximately 300 students. The band director stated that the...
The Marcus High School Marching Band has approximately 300 students. The band director stated that the average band member spends 6 hours of practice time each week. 120 band members were polled and asked how much they practiced. The mean was 5.8 hrs and the standard deviation was 2. The standard deviation of 2 came from the sample of 120 band members. The level of significance was 0.05. What is the critical value and test statistic? What is the appropriate decision?
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The Marcus High School Marching Band has approximately 300
students. The band director stated that the...
A business school placement director wants to estimate the mean annual salaries 5 years after students...
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A recent national survey found that high school students watched an average (mean) of 7.0 DVDs...
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A business school placement director wants to estimate the mean annual salaries 5 years after students graduate. A random sample of such graduates found a sample mean of $427,400. A confidence interval for the population mean annual salaries 5 years after students graduate is then estimated to be from $419,020 to $435,780. If the placement director considers that this confidence interval is too wide and would like to have an interval of half width only, what should he do? Select...
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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...
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