Based on a small sample, a significance test may not yield a statistically significant outcome even if the true value is considerably different from the null value. This outcome is also known as? * O significance level O type I error O type II error power of the test
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- What is meant by the sample space of an experiment?A researcher looks at the mean salaries of male and female electricians and decides based on the evidence that there is no difference between the two groups. Given that there was a failure to reject the null hypothesis, it is possible that a type II error was made. Given the type of error made in this situation, what could researchers do to reduce the risk of this error? Choose a .01 significance level, instead of a .05 significance level. Increase the sample size.Suppose the results indicate that the null hypothesis should not be rejected; thus, it is possible that a type II error has been committed. Given the type of error made in this situation, what could researchers do to reduce the risk of this error? Choose a 0.01 significance level, instead of a 0.05 significance level. Increase the sample size.
- Suppose the results indicate that the null hypothesis should be rejected; thus, it is possible that a type I error has been committed. Given the type of error made in this situation, what could researchers do to reduce the risk of this error? Choose a 0.01 significance level, instead of a 0.05 significance level. Increase the sample size.A pipes manufacturer makes pipes with a length that is supposed to be 19 inches. A quality control technician sampled 36 pipes and found that the sample mean length was 19.03 inches and the sample standard deviation was 0.17 inches. The technician claims that the mean pipe length is not 19 inches. What type of hypothesis test should be performed? What is the test statistic? What is the number of degrees of freedom? Does sufficient evidence exist at the α=0.1 significance level to support the technician's claim?A random sample of 319 front-seat occupants involved in head-on collisions in a certain region resulted in 95 who sustained no injuries. We wish to use this sample data to test whether the true proportion of uninjured occupants in head-on collisions exceeds 0.25 or not. What would your conclusions be for this test of hypothesis, given a 5% significance level?
- Use 0.05 significance level, test the claim that at least one of the mean hurricane intensities is different from others. Fill out the one way ANOVA table to complete the hypothesis test.A recent study focused on the number of times men and women send a Twitter message in a day. The information is summarized here. Sample Size Sample Mean Population Standard Deviation Men 25 23 5 Women 30 28 10 At the 0.01 significance level, is there a difference in the mean number of times men and women send a Twitter message in a day? Based on the p-value, what is your conclusion? Reject the null hypothesis and conclude the means are the same. Fail to reject the null hypothesis and conclude the means are different. Fail to reject the null hypothesis. Reject the null hypothesis and conclude the means are different.A rods manufacturer makes rods with a length that is supposed to be 19 inches. A quality control technician sampled 21 rods and found that the sample mean length was 19.03 inches and the sample standard deviation was 0.11 inches. The technician claims that the mean rod length is more than 19 inches. What type of hypothesis test should be performed? What is the test statistic? What is the number of degrees of freedom? Does sufficient evidence exist at the α=0.1 significance level to support the technician's claim?
- A construction firm claims that security cameras are installed in 50% of properties being constructed today in Tokyo. Would you agree with this claim if a random survey of new homes in this town showed that 100 out of 150 had security cameras installed? Use a 0.10 level of significance. This problem is a test on what population parameter? What is the null and alternative hypothesis? What are the Significance level and Type of test? What is the Critical Value? What is the Standard test statistic? What is the Statistical Decision in statement form?When using a statistical software such as R for hypothesis testing, the p-value is compared with the ____________________ to determine whether the null hypothesis is rejected or not. A. critical value of the test statistic.B. computed value of the test statistic.C. level of significanceD. degrees of freedom.In a study of the accuracy of fast food drive-through orders, one restaurant had 30 orders that were not accurate among 393 orders observed. Use a 0.05 significance level to test the claim that the rate of inaccurate orders is equal to 10%. Does the accuracy rate appear to be acceptable? Part 1 Identify the null and alternative hypotheses for this test. Choose the correct answer below.