sample test

Assume that the weights of 3,000 students at a university are normally distributed with mean 150 pounds and a standard deviation of 7 pounds. If 100 samples of 30 students each are obtained, then what would be the expected mean and standard deviation of the resulting sampling di..

In a survey it was found that 20% of people living in a society watch channel A. If a random sample of 10 people is selected, then find the probability that exactly 5 people in the sample watch channel A. => 0.5 or 0.2 or 0.026 or 0.26..

In a survey it was found that 20% of people living in a society watch channel A. If a random sample of 10 people are selected, then find the probability that at least 3 people in the sample watch channel A. => 0.59 or 0.3 or 0.2 or 0.323..

The average price for different configurations of laptops in a shop is $1,300. Assume the standard deviation is $300. If a random sample of 9 laptops is selected, then find the probability that the mean of the sample will be less than $1,000. => 0.13% or 49.87% or 99.87% or 13% ..

Average score of the students in a statistics contest is 65, and the standard deviation is 15. If a random sample of 16 students who participated in the contest are selected, then find the probability that the sample mean of the scores lies between 61 and 67. => 15.52% or 20.25%..

The manager of the local branch of a savings bank has determined that 30% of all depositors have multiple accounts at the bank. If a random sample of 200 depositors was selected, what is the probability that sample proportion of depositors will be between 0.30 and 0.33? => 0.477..

The number of ATM transactions of a bank per day were recorded at 12 locations in a city. The mean of the sample was 88.5 transactions, with a sample standard deviation of 42. Find the 98% confidence interval of the true mean. => 19.06 < μ < 157.94 or 78.99 < μ &l..

When a 95% confidence interval is calculated instead of a 90% confidence interval with the same sample, the maximum error of estimate will be _____ . => either smaller or larger depending on sample size or the same or smaller or larger..

Every fourth passenger boarding the aircraft was requested to fill up a small questionnaire to find out the customer satisfaction. The data collection methodology is _______ sampling. => stratified or systematic or random or cluster..

A survey was conducted among the patients of two hospitals in the city to assess the general facilities in health care. What type of sampling is used? => cluster or stratified or systematic or random..