Ifthe test statistic for a left-tailed test is z = -1.72, then P-value is 0.9518.

True

False

Assumethat the data has a normal distribution and the number of observations is greater than fifty. With a confidence level = 0.05 for a right-tailed test, the criticalvalue used to test a null hypothesis is 1.645.

True

False

If a regression equation is = 2x, then slope of this line is equal to 2.

True

False

If calculated |r| > critical value ofr,then there is a linear correlation between the variables.

True

False

If a fitted linear regression equation between the variablesxandyis=8-x, then the predicted value ofyatx =- 2is equal to 6.

True

False

Ifr= 0.8, thenr²= 0.64, which means that 64% of the total variation in y is explained by regression line.

True

False

Thealternative hypothesis for the following claim:"A car Company claims that its new SUV car will average at least 50 miles per gallon in the city" is H₁: > 50.

True

False

For a hypothesis test about a population mean, if the level of significance is 0.05 and the P-value is 0.50, then we fail to reject the null hypothesis.

True

False

The null Hypothesis is rejected, if the P-value is larger than significance level.

True

False

A null hypothesis is that the mean weight of men and women are same and the alternative hypothesis is that men have more mean weight than women. The correct way to state the null hypothesis is

True

False

A simple random sample of 196 adults is obtained and each person's white blood cell count(in cells per microliter) is measured. The sample mean is 7.35 and the sample standard deviation is 0.50. Use a 0.01 significance level to test the claim that the sample is from a population with a mean less than 7.45, the calculated value of t-test statistic is

(Given that H₀: = 7.45, H₁:

2.800

-4.089

-2.800

3.396

When carrying out a large sample test of H0: ₀= 50, H_a: ₀>50, we reject H0at level of significance when the calculated test statistic is:

Less than -z

Greater than z_/2

Greater thanz

Less thanz

Four students took a statistics test before and after coaching, but coaching did not affectthe scores of students i.e. mean change in scores is zero. Their scores are as follows:

Students A B C D Before 62 88 64 70 After 60 89 60 74