Revenues reported last week from 25 randomly selected stores owned by an international clothing company averaged 59,540 with a standard deviation of 9,025. Interpreting the 95 confidence level: If we repeated this procedure with the same sample size, we would expect 95 of the resulting confidence intervals to contain the
1.population mean revenue of the company's stores.
2.sample mean value of 59,540.
3.population mean value of 59,540.
4.range of revenue of all the company's stores.
Q. 2Revenues reported last week from 25 randomly selected stores owned by an international clothing company averaged 59,540 with a standard deviation of 9,025. Assume all necessary data conditions are met. What is the 95 confidence interval for the mean revenues of all the company's stores?<--EndFragment--> span>
1.59540 1805 (57735, 61345)
2.59540 (0.95)(1805) (57625.25, 61254.75)
3.59540 (2.06)(1805) (55821.7, 115361.7)
4.It cannot be computed since we cannot find the multiplier t.
Q. 3Revenues reported last week from 25 randomly selected stores owned by an international clothing company averaged 59,540 with a standard deviation of 9,025. The standard error calculated of the sample mean estimates
1.the standard deviation of revenues for all the company stores.
2.the standard deviation of the sampling distribution of the sample mean.
3.the standard deviation of the sampling distribution of the population mean.
4.nothing and is practically a useless quantity.
Q. 4Revenues reported last week from 25 randomly selected stores owned by an international clothing company averaged 59,540 with a standard deviation of 9,025. What is the value of the standard error of the sample mean?
1.9,025
2.1,805
3.361
4.11,908
Q. 5Revenues reported last week from 25 randomly selected stores owned by an international clothing company averaged 59,540 with a standard deviation of 9,025. Which of the following statements uses the appropriate terminology and notation to represent the 59,540? The 59,540 represents _____.
1.the parameter
2.the parameter
3.the statistic
4.the statistic
Q. 6Commute distances for employees of a large company have a distribution that is quite skewed. Suppose the mean commute distance is 20 miles and that the standard deviation is 7 miles. What can be said about the mean commute distance for a random sample of size 49 employees from this plant?<--EndFragment--> /span>
1.The distribution of will be approximately normal with mean 20 and standard deviation 7.
2.The distribution of will be approximately normal with mean 20 and standard deviation 1.
3.The mean and standard deviation of will be 20 and 7, but the sampling distribution of will not be approximately normal.
4.The mean and standard deviation of will be 20 and 1, but the sampling distribution of will not be approximately normal.
5. will have a standard normal distribution.
Q. 7The spread of the sample mean decreases when
1.the population mean increases.
2.the population standard deviation increases.
3.the sample mean decreases.
4.the sample size decreases.
5.the sample size increases.
Q. 8A t curve is bell-shaped like the z curve but is less spread out.
1.True
2.False
Q. 9The t confidence interval formula for estimating should only be used when the population being sampled is at least approximately normally distributed.
1.True
2.False
Quick Reply
