In order to determine an interval for the mean of a population with unknown standard deviation a sample of 61 items is selected. The mean of the sample is determined to be 23. The number of degrees of freedom for reading the t value is ____.a22b23c60d61multiple_choice86824620Question 2 (1 point)In order to determine an interval for the mean of a population with unknown standard deviation a sample of 41 items is selected. The mean of the sample is determined to be 43. The number of degrees of freedom for reading the t value is ___.a22b23c40d61multiple_choice86824540Question 3 (1 point)Convenience sampling is an example of ____.aprobabilistic samplingbstratified samplingcnon-probabilistic samplingdcluster samplingmultiple_choice86824622Question 4 (1 point)From a population with a variance of 625, a sample of 625 items is selected. At 95% confidence, the margin of error is approximately ___.a15b2c3.92d1multiple_choice86824594Question 5 (1 point)If we want to provide a 95% confidence interval for the mean of a population, the confidence coefficient is ____.a0.485b1.96c0.95d1.645multiple_choice86824582Question 6 (1 point)In point estimation _____.adata from the population is used to estimate the population parameterbdata from the sample is used to estimate the population parametercdata from the sample is used to estimate the sample statisticdthe mean of the population equals the mean of the samplemultiple_choice86824630Question 7 (1 point)A simple random sample was taken from a large normal population. The sample mean and the population standard deviation were determined to be 80 and 12, respectively. What random sample size is needed to determine within +/-2 the true population mean within a 99% confidence?a229b16cimpossible to determined239multiple_choice86824610Question 8 (1 point)The farther the sample mean is from the population mean ___.athe larger the sampling errorbthe smaller the sampling errorcthe likelier it is that the sampling error equals 1dnone of the abovemultiple_choice86824602Question 9 (1 point)If an interval estimate is said to be constructed at the 90% confidence level, the confidence coefficient would be ____.a0.1b0.95c0.9d0.05multiple_choice86824626Question 10 (1 point)A simple random sample of 10 observations was taken from a large normal population. The sample mean and the sample standard deviation were determined to be 80 and 12, respectively. A 95% population mean confidence interval is approximately ___.a71.4 to 88.6b72.6 to 87.4cimpossible to determined77.9 to 89.9
