Given that a professor sets a standard examination at the end of each semester for all sections of a course. The variance of the scores on this test is typically very close to 300.

$H_0: s^2 = 300\\H_a: s^2 \neq 300$

(Two tailed test for variance )

Sample variance =480

We can use chi square test for testing of hypothesis

Test statistic = $\frac{(n-1)s^2}{\sigma^2} \\=62.4$

p value = 0.0100

Since p <0.05 our significance level, we reject H0.

The sample variance cannot be claimed as equal to 300.

5 0

3 years ago

C(x)=4x-2 and d(x)=x^(2)+5, what is (c*d)(x)

lawyer [7]

Answer:4x^3-2x^2+20x-10

Step-by-step explanation:

5 0

3 years ago

Of the new cars in a car dealer's lot, 1 in 6 are white. Today, 4 cars were sold.

stiks02 [169]

A) 1 out of 4
B) 1 out of 4

5 0

3 years ago

207,567 to the nearest hundred thousand

Nezavi [6.7K]

The hundred thousands place is the 2. Since the place below that is 0, it rounds down.
200,000

6 0

3 years ago

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