Questions related to Statistics II - Hamro CSIT

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Write short notes on the following.

i. Partial and multiple correlation coefficient.

ii. Properties of good estimator.

Answered Statistics II Asked on 2079 Exam

What are the basic concepts of queuing theory? In a super market, the average arrivals rate of customer is 10 per every 30 minutes following Poisson process. The average time taken by the cashier to list and calculate the customers purchase is 2.5 minutes following exponential distribution. What is the probability that queue length exceeds 6? What is the expected time spent by customer in the system?

Answered Statistics II Asked on 2079 Exam

Define Markov chain and its characteristics.

Answered Statistics II Asked on 2079 Exam

An effort to estimate the mean amount per customer for dinner at a major Atlanta restaurant, data were collected for a sample of 49 customers and sample mean is found at $24.80. Assume population standard deviation is $5.

a. Compute standard error of mean.

b. Find 95% confidence interval estimate for the population mean.

Answered Statistics II Asked on 2079 Exam

It is claimed that Samsung and Redmi mobiles are equally popular in Kathmandu. A random sample of 500 people from Kathmandu showed 300 have Samsung mobile. Test the claim at 5% level of significance.

Answered Statistics II Asked on 2079 Exam

Social media users use a variety of devices to access social networking; mobile phones are increasingly popular. However is there a difference in the various age groups in the proportions of social media users who use their mobile phone to access social networking? A study showed the following results for the different age groups.

Use mobile phones to access social networking? Age

18-34 35-64 65+

Yes 60 37 14

No 40 63 86

At the 0.05 level of significance, is there evidence of a difference among the age groups with respect to use of mobile phones for accessing social networking?

Answered Statistics II Asked on 2079 Exam

Bank of Nepal recorded the sex of first 30 customers who appeared last Monday with notation M M F M M F M F F M M M F F M F F M F F M F F F M F M M M F F. At the 0.005 level of significance, test the randomness of this sequence.

Answered Statistics II Asked on 2079 Exam

What do you mean by non parametric test? Write down advantages of non parametric test over parametric tests?

Answered Statistics II Asked on 2079 Exam

The following ANOVA summary table was obtained from a multiple regression model with two independent variables:

Souce of variation Sum of square Degree of freedom Mean sum of square F-value

Regression 12.62 2 ? ?

Error 0.78 12 ?

Total 13.40 14

i. Determine the mean sum square due to regression, the mean sum square due to error and F-value.

ii. Test the significance of overall model at 5% level of significance.

iii. Compute coeff of determination and interpret its value.

iv. Find standard error of estimate.

Answered Statistics II Asked on 2079 Exam

Define Type I and Type II error in testing of hypothesis. A psychologist wishes to verify that a certain drug increases the reaction time to given stimulus. The following reaction times (in tenth of seconds) were recorded before and after injection of the drug for each of four subjects:

Subject 1 2 3 4

Reaction Time Before 7 2 12 12

After 13 3 18 13

Test at 5% level of significance to determine whether the drug significantly increases the reaction time.

Answered Statistics II Asked on 2079 Exam

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