MED-105 Statistical Methods in Education 23-25

The height of ordinate in the unit normal curve is equal to ____.

• 0.3989

• 0.6745

• 0.7979

• 0.9345

Which of the following assumptions is not for statistical inference based on parametric tests?

• When the variables described are expressed in interval or ratio scales and not in nominal or ordinal scales of measurement.

• When population values are normally distributed.

• When the samples have equal or nearly equal variances.

• When the selection of one case in the sample is not independent upon the selection of any other.

Standard score (designated by a symbol Z) has been calculated by the formula (if X is raw Score, M is Mean of the Group and σ is S.D.):

How can standard error be minimized?

• By reducing the sample size

• By increasing the sample size

• Nothing can be done to reduce the standard error

• By computing mean and standard deviation

A hypothesis test in which the population parameter is known to fall either left or right of center of the sampling distribution is called _____________.

• one tailed test

• two tailed test

• one tailed as well as two tailed

• No tailed

One tailed test has _______ statistical power to detect in one direction than a two tailed test with the same design and significance level.

• More

• Less

• Equal

• Zero

If in place of non-directional hypothesis, researcher frames directional hypothesis, which of the following error is likely to occur while making inference?

• Type-1 Error

• Type-2 Error

• Both Type-1 as well as Type-2 Error

• No Error

The mean of some test score of a sample of 400 students is 30 and SD is 5. Compute standard error of mean.

• 4.0

• 0.25

• 13.33

• 0.075

If the obtained t-value is more than the critical value (table value) of t at 0.05 level of significance, what will be decision regarding null-hypothesis?

• Null hypothesis is not rejected at 0.05 level of significance

• Null hypothesis is rejected at 0.05 level of significance

• Null hypothesis can be rejected or not rejected at 0.05 level of significance

• No decision can be taken regarding the rejection or non-rejection of null hypothesis

Which one of the following is not true regarding Degrees of Freedom?

• One df is lost for each restriction imposed.

• When a statistics is used to estimate a parameter, the number of degrees of freedom depends upon the restrictions placed.

• The number of degrees of freedom will vary from one statistics to another

• When a statistics is used to estimate a parameter, the number of degrees of freedom does not depend upon the restrictions placed.