21) The mean annual tuition and fees for a sample of 13 private colleges was $31,900...

 

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21) The mean annual tuition and fees for a sample of 13 private colleges was $31,900 with a standard deviation of $4600 A dotplot shows that it is reasonable to assume that the population is approximately normal. You wish to test whether the mean tuition and fees for private colleges is different from $34,400. State a conclusion regarding Ho. Use the a= 0.01 level of significance. A) Do not reject Ho- There is insufficient evidence to conclude that the mean annual tuition and fees is different from $34,400. B) Reject Ho. The mean annual tuition and fees appears to be different from $34,400. C) There is not enough information to draw a conclusion. 22) At a certain university, 22% of students fail general chemistry on their first attempt. Professor Brown teaches at this university and believes that the rate of first-time failure in his general chemistry classes is 16%. He samples 75 students from last semester who were first-time enrollees in general chemistry and finds that 16 of them failed his course. Using a = 0.05, can you conclude that the percentage of failures differs from 16%? A) No B) Yes 21) The mean annual tuition and fees for a sample of 13 private colleges was $31,900 with a standard deviation of $4600 A dotplot shows that it is reasonable to assume that the population is approximately normal. You wish to test whether the mean tuition and fees for private colleges is different from $34,400. State a conclusion regarding Ho. Use the a= 0.01 level of significance. A) Do not reject Ho- There is insufficient evidence to conclude that the mean annual tuition and fees is different from $34,400. B) Reject Ho. The mean annual tuition and fees appears to be different from $34,400. C) There is not enough information to draw a conclusion. 22) At a certain university, 22% of students fail general chemistry on their first attempt. Professor Brown teaches at this university and believes that the rate of first-time failure in his general chemistry classes is 16%. He samples 75 students from last semester who were first-time enrollees in general chemistry and finds that 16 of them failed his course. Using a = 0.05, can you conclude that the percentage of failures differs from 16%? A) No B) Yes

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