Use the following information for questions:
A safety officer wants to prove that $\mu$ = the average speed of cars driven by a school is less than 25 mph. Suppose that a random sample of 14 cars shows an average speed of 24.0 mph, with a sample standard deviation of 2.2 mph. Assume that the speeds of cars are normally distributed.
-What is the value of the test statistic?
A) t = -01.80
B) t = -1.70
C) t = -1.50
D) None of the above

Question

Use the following information for questions:
 A safety officer wants to prove that $\mu$ = the average speed of cars driven by a school is less than 25 mph. Suppose that a random sample of 14 cars shows an average speed of 24.0 mph, with a sample standard deviation of 2.2 mph. Assume that the speeds of cars are normally distributed.
-What is the value of the test statistic?
A) t = -01.80
B) t = -1.70
C) t = -1.50
D) None of the above

Quizplus · Accepted Answer

The test statistic is calculated using the formula: $ t = \frac{\bar{x} - \mu}{s/\sqrt{n}} $, where $\bar{x} = 24.0$, $\mu = 25$, $s = 2.2$, and $n = 14$. Plugging in these values gives $ t = \frac{24.0 - 25}{2.2/\sqrt{14}} \approx -1.70 $.

Use the Following Information for Questions: a Safety Officer μ\muμ

Use the Following Information for Questions:
a Safety Officer $\mu$