2- A randon sample of College students were asked how moch money they spent on books and supplies...
2- A randon sample of College students were asked how moch money they spent on books and supplies this senester. Beze are the sumary statistics: a-10 $249, s-$30.construct a 90% confidence interval tor the nean coats for all college students. Assune that the anount spent on books and supplies by college students is nonally distributed. 3- A researchez wants to estinate the mean beights of 8- year- old gizis. It is coc that the population standard deviation is 2.9 inches. Bow large the sample should be in order to be 95% confident that the estimate is within 0.3 inches of the popalation ean? -& consner group ciains that the mean annual consunption person in the 0s is at most 10.3 lbs. A randon sanple of 100 people in the DS has a nean ancoal cheddar cheese consnption of 9.9 1bs. Assune the population standard deviation is 2.1 lbs. Use a 0.05 significant level to test the clain ehat the popalation ean of cheddar cheese consunption per person in the Us is at most 10.3 lbs of cheddar cheese by a 5- consider the 90% confidence interval for the mean of student evaluation ratings of coarses at a certain sniversity (3.67, 4.17 al Calcalate the point estinate of b) Calcalate tbe nargis of ezzor 6-Asedical researcher says that less than 25% of us are smokers. In a randon s-le of 200 CS adults 19.3% say that they are smokers. a) state the bypothesis Testing problen and specity the claim and the type of cest b) 14st tbe assnption and calculate the test statistic. 7- True or False: a) α is the probability of Type-1 Error b) For a given standard error lower conidence levels produce wider confidence c) Oze way to get a nazzover confidence interval is to increase the sample d) The equal sig is alvays zeserved for the null hypothesis. intervals size. e) The z score corresponding to 99% confidence level is 1.96
2- A randon sample of College students were asked how moch money they spent on books and supplies this senester. Beze are the sumary statistics: a-10 $249, s-$30.construct a 90% confidence interval tor the nean coats for all college students. Assune that the anount spent on books and supplies by college students is nonally distributed. 3- A researchez wants to estinate the mean beights of 8- year- old gizis. It is coc that the population standard deviation is 2.9 inches. Bow large the sample should be in order to be 95% confident that the estimate is within 0.3 inches of the popalation ean? -& consner group ciains that the mean annual consunption person in the 0s is at most 10.3 lbs. A randon sanple of 100 people in the DS has a nean ancoal cheddar cheese consnption of 9.9 1bs. Assune the population standard deviation is 2.1 lbs. Use a 0.05 significant level to test the clain ehat the popalation ean of cheddar cheese consunption per person in the Us is at most 10.3 lbs of cheddar cheese by a 5- consider the 90% confidence interval for the mean of student evaluation ratings of coarses at a certain sniversity (3.67, 4.17 al Calcalate the point estinate of b) Calcalate tbe nargis of ezzor 6-Asedical researcher says that less than 25% of us are smokers. In a randon s-le of 200 CS adults 19.3% say that they are smokers. a) state the bypothesis Testing problen and specity the claim and the type of cest b) 14st tbe assnption and calculate the test statistic. 7- True or False: a) α is the probability of Type-1 Error b) For a given standard error lower conidence levels produce wider confidence c) Oze way to get a nazzover confidence interval is to increase the sample d) The equal sig is alvays zeserved for the null hypothesis. intervals size. e) The z score corresponding to 99% confidence level is 1.96