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It is thought that 12% of all students taking a particular course received a grade of...

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Statistics

It is thought that 12% of all students taking a particularcourse received a grade of A. In a sample of 155 students, it isfound that 21 made an A. can we conclude that the ratio of studentswith grade of A is higher than 12%? To do so

a) State the null and alternative hypotheses.

b) Compute the test statistic-value.

c) Find the critical-value.

d) Identify the decision rule and express your decision.

Answer & Explanation Solved by verified expert
3.7 Ratings (356 Votes)
Here we have to use one sample z test for the population proportion The null and alternative hypotheses for this test are given as below Null hypothesis H0 the ratio of students with grade of A is    See Answer
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