Data Analytics with Python Nptel Week 4 Assignment Answers
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Data Analytics with Python Nptel Week 4 Quiz Answers (Jan-Apr 2025)
Q1. If we have a sample size of 20 and the population standard deviation is known, we will use:
a) t-test for hypothesis testing
b) z-test for hypothesis testing
c) both t and z test
d) F-test
Q2. Null hypothesis, Ho: m1 – m2 = 0 is a:
a) Upper tail test
b) Lower tail test
c) Two tail test
d) F Test
Q3. The quality-control manager at a Li-Battery factory needs to determine whether the mean life of a large shipment of Li-Battery is equal to the specified value of 375 hours. The process standard deviation is known to be 100 hours. A random sample of 64 batteries indicates a sample mean life of 350 hours.
State the null and alternative hypotheses:
a) Mu = 375
b) Mu ≤ 375
c) Mu = 350
d) Mu ≥ 350
Q4. In question 3, at the alpha = 0.05 level of significance, is there any evidence that the mean life is different from 375 hours?
a) Yes, there is
b) No, there is not
c) None of the above
Q5. For a one-tailed test, the test statistic z is determined to be zero. The p-value for this test is:
a) Zero
b) -0.5
c) +0.5
d) 1.00
Q6. The error of rejecting a true null hypothesis is:
a) A Type I error
b) A Type II error
c) Is the same as b
d) Committed when not enough information is available
Q7. The mean cost of a hotel room in a city is said to be $168 per night. A random sample of 25 hotels resulted in X̄ = $172.50 and sample standard deviation s = 15.40. Calculate the t statistic.
a) 2
b) -2
c) 1.46
d) -1.46
Q8. In hypothesis testing, if the null hypothesis is rejected:
a) No conclusions can be drawn from the test
b) The alternative hypothesis is true
c) The data must have been accumulated incorrectly
d) The sample size has been too small
Q9. In the hypothesis testing procedure, α is:
a) 1 – the level of significance
b) The critical value
c) The confidence level
d) Level of significance
Q10. If a hypothesis is rejected at the 5% level of significance, it:
a) Will always be rejected at the 1% level
b) Will always be accepted at the 1% level
c) Will never be tested at the 1% level
d) May be rejected or not rejected at the 1% level
Data Analytics with Python Nptel Week 4 Quiz Answers (Jan-Apr 2025)
For answers to additional Nptel courses, please refer to this link: NPTEL Assignment