Introduction to Statistics- Late Spring 2018 -Int.. Suppose that we want to esti

Question

Introduction to Statistics- Late Spring 2018 -Int.. Suppose that we want to estimate the mean PCB Po chlorinated bi hery level in white croaker sh om he San ?anci cota me e ple esec mean of 638 parts per million and a standard deviation of 55 parts per million. For each of the following sampling scenarios, determine which test statistic is appropriate to use when making inference statements about the population mean. (In the table, Z refers to a variable having a standard normal distribution, and t refers to a variable having a t distribution.) could use Sampling Scenario z t either Z or unclear (1) The sample has size 95, and it is from a non- normally distributed population. (2) The sample has size 20, and it is froma population with a distribution about which we know very little (3) The sample has size 19, and it is from a normally distributed population with a known standard deviation of 54. 0) (4) The sample has size 75, and it is from a non- normally distributed population with a knowrn standard deviation of 54 (5) The sample has size 11, and it is from a normally distributed population with unknown standard deviation Submit Ass Worked Example O Type here to search

Explanation / Answer

If the distribution is not known and the sample size is greater than 30 then we use the normality assumption otherwise t-distribution. Also, if the sample is from normal distribution then test statistic is normal.

Thus,

1.Z distribution

2.t-distribution

3.Z distribution

4.Z-distribution

5.Z-distribution

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.