Please help. Question 8 may have more than one answer.

Q1 0.5 Points When is the standard error of the sample mean used instead of the standard deviation of the sample mean? 0 When the value of the sample standard deviation is unknown and it is estimated by the population standard deviation. 0 When the value of the population standard deviation is unknown and it is estimated it by the sample standard deviation. Save Answer 02 0.5 Points Which of the following statements are true regarding the t distribution and the standard Normal distribution? They are both symmetric. They are both centered at 0. They are both bell-shaped. They are both dened by degrees of freedom. The t distribution has slightly larger spread. Save Answer 03 0.5 Points Which statement is true regarding t\" and 2* for confidence intervals? 0 For a given confidence level. t\" is never smaller than 2*. O For a given confidence level. t\" is never larger than 2:\". 0 Neither statement is correct because it depends on the situation. Save Answer 04 0.5 Points When is the t-test used instead of the z-test for a one-sample hypothesis test for the mean? 0 When the distribution of the variable of interest is not Normal. 0 When the sample size is small and the Central Limit Theorem does not hold. 0 When the value of the population standard deviation is unknown and the sample standard deviation is used to estimate it. Save Answer 05 0.5 Points What is t* for a 98% condence interval with 37 degrees of freedom? 0 1.8001 0 2.1287 0 2.4314 0 24345 Save Answer 06 0.5 Points Which of the following symbols is used to represent the standard deviation of the sample? Save Answer 07 0.5 Points What is the main difference between a 06) distribution and a N\"), 1) distribution? 0 The 33 distribution is skewed O The 33 distribution has a mean of k, the degrees of freedom 0 The 33 distribution has thicker tails O The 33 distribution has multiple modes {more than one \"peak" in its density curve). 08 0.5 Points Which of the following describe a common scenario where you may perform a matched pairs t test? You may assume that each comparison investigates comparing means of the two samples. Comparing each of 50 married individuals exercise habits with their spouses Comparing 50 people in Chicago with 50 people in San Francisco Comparing a sample of adults exposed to asbestos as children to a sample of all their children, who were not exposed to asbestos {the second sample is larger than the rst). Comparing the same 50 individuals before and after participating in a multi-week study on meditation and mindfulness. Save Answer 09 0.5 Points Which is the formula for a t condence interval? ohm? Omit'k * sima Omit *Lm a: 3 Omit akm Save