The area to the right of z = 1.83 is approximately equal to -0.0336. A. True B.

Question

The area to the right of z = 1.83 is approximately equal to -0.0336. A. True B. False The procedure whereby conclusions about a population are made on the basis of the results obtained from a sample drawn from that population is called: A. simple random sampling B. inferential statistics C. descriptive statistics D. sampling error In the construction of confidence intervals, if all other quantities are unchanged, a decrease sample in size will lead to a ____ interval. A. narrower B. wider C. unchanged D. not enough info given 4. The t distribution approaches the standardized normal distribution as the sample size ______. A. increases B. decreases C. does not approach the normal distribution 5. The width of a confidence interval is determined, in part, by the variability present in the population. A. True B. False The rejection of a true null hypothesis is known as a ______. A. good decision B. Type I Error C. Type II error D. sampling error If the null hypothesis is rejected, we have proven that the alternative is true. A. True B. False Values of the test statistic that separate the acceptance region from the rejection region are called ______ values. A. Calculated B. critical C. sample D. population The statement of what the investigator is trying to conclude is placed in the ________ hypothesis. A. null B. alternative C. accepted D. rejected Which of the following is not true when applied to the t distribution? A. it approaches the standardized normal distribution as n approaches infinity B. it is symmetric about its median C. it has a mean of 0 and a variance of 1 D. there is a different t distribution for each degree of freedom value When the value of the level of significance is increased the probability for committing a Type II error A. increases B. decreases C. stays the same

Explanation / Answer

1) we need to read the z table

Z >1.83

P ( Z>1.83 )=1P ( Z<1.83 )=10.9664=0.0336 , so yes True

2) The correct answer is B , Inferential statistics refers to studying the sample drwan from a population and then infereing results about the population based on the sample results.

3) As the sample size increases, the interval and its width decrease. so if sample size is decreased , the CI would widen. so B

4) as sample size increases , the distribution approaches towards normality. Hence A

Please note that we can answer only 4 MCQ at a time ,as per the answering guidelines

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