Question

Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis. α-0.05for a left-tailed test. SELECT ALL APPLICABLE CHOICES B) 1.96 士1.96 ±1.645 1.645 E) None of these 19 Assume that a simple random sample has been selected from a normally distributed population and test the conclusion that addresses the original claim and select three correct choices. A test of sobriety SELECT ALL APPLICABLE CHOICES A) Not enough evidence to reject the Ho given claim. State the final B) Ho: μ 35 (claim) involves measuring the subject's motor skills. μ<35 1: Twenty randomly selected sober subjects take the test and produce a mcan score of 41.0 with a standard deviation of 3.7. At the 0.01 level of significance, test the claim that the true mean score for all sober subjects is the traditional method of testing hypotheses. C) There is enough evidence to support the Ho D) Not enough evidence to reject the Claim E) F There is enough evidence to reject the Ho G)There is enough eviden H) There is enough evidence to reject the Claim equal to 35.0. Use H0: μ=35 (claim) ce to support the Claim H1 : μメ53 I) None of these Express the null hypothesis and the alternative hypothesis in symbolic form. An entomologist writes an article in a scientific journal which claims that fewer than 3 in ten thousand male fireflies are unable to produce light due to a genetic mutation. Use the parameter p, the true proportion of fireflies SELECT ALL APPLICABLE CHOICES Ho:p <0.0003 (claim) Ho:p 2 0.0003 H1:p 2 0.0003 Hi:p <0.0003 (claim) unable to produce light. Ho : p = 0.0003 Ho:p > 0.0003 (claim) H1: p 0.0003 (claim) H1 : ps0.0003 E) None of these

Answer 1

18)
for left tailed
P(Z< z*) = 0.05
z* = -1.645
option D) is correct

19)

Ho: mu = 35
Ha: mu not equal 35

t = (Xbar - mu)/(s/sqrt(n))
= (41 - 35)/(3.7/sqrt(20))
= 7.252112

p-value < 0.01
we reject the null

correct options F) and H)
and option E) would have correct if 35 would have instead of 53

19)

optio B) is correct