Week3 - Assignment 3
Sate True or False:
Statement: The specific value of a random variable is called estimator
1 point
If the true proportion of customers who are below 20 years is P=0.35, what is the probability that a sample size 100 yields a sample proportion between 0.3 to 0.4
1 point
Stratified random sampling is a method of selecting a sample in which
1 point
Sate True or False:
Statement: A population is a set of all items or individual of interest
1 point
A question paper contains 90 multiple choice questions. There are 4 alternative answers (A, B, C or D) out of which only one is correct. Mr X answers these questions randomly (i.e. without preparation). What is the probability that X gets a score of at least 10 marks?
1 point
On an average 5 % items supplied by manufacturer X are defectives. If a batch of 10 items is inspected: what is the probability that 2 items are defective
1 point
A car distributor in city Y experiences on an average 2.5 car sales per day. Find the probability that on a randomly selected day, they will sell 5 car:
1 point
A car distributor in city Y experiences on an average 2.5 car sales per day. Find the probability that on a randomly selected day, they will sell no car:
1 point
A random sample of 100 people shows that 25 of them are females and rest are males. Form a 95% confidence interval for the true proportion of females. The lower limit of this interval will be:
1 point
A random sample of 100 people shows that 25 of them are females and rest are males. Form a 95% confidence interval for the true proportion of females. The upper limit of this interval will be:
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