The mean weight of a random sample of n apples of a particular kind is to be used to estimate the mean weight of all such apples. If σ= 1.5 oz and the probability is to be 0.95 that the estimate is in error by at most 0.5 oz, then n must be equal to: | | 24 | | | 25 | | | 34 | | | 35 | A sample size of 14 is used to find a confidence interval. The number of degrees of freedom needed is
13

A small sample confidence interval formula for a population mean differs from the corresponding large sample formula in that the small sample formula contains a ____________

The sample standard deviation S may be used in place of σ in the large sample confidence interval for N provided that n is at least _____________ .

Consider a large population with a mean of 150 and a standard deviation of 27. A random sample of size 36 is taken from this population. The standard error of the sampling distribution of sample mean is equal to: | | 4.17 | | | 5.20 | | | 4.50 | | | 5.56 | Which of the following is NOT true for the t distribution ? | | Its shape depends on the number of degrees of freedom | | | Its mean depends on the number of degrees of freedom | | | it is symmetrical | | | It is bell shaped |
The endpoints of a confidence interval are called the confidence limits

A single number which is used as an estimate of an unknown parameter is called a _________estimate
Point

To obtain a large sample confidence interval for the population proportion, p, we use the: | | t distribution | | | normal distribution | | | binomial distribution | | | chi-square distribution | If we increase the confidence level, then we decrease the width of the interval. True