TRUE/FALSE: For a hypothesis test, using a fixed sample, increase the value of significance level a, will decrease the probability of type Il error.
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- Is there any difference in the variability in golf scores for players on a women's professional golf tour and players on a men's professional golf tour? A sample of 20 tournament scores from events in a tour for women showed a standard deviation of 2.4638 strokes, and a sample of 30 tournament scores from events in a tour for men showed a standard deviation of 2.2121. Conduct a hypothesis test for equal population variances to determine if there is any statistically significant difference in the variability of golf scores for male and female professional golfers. Use a = 0.10. State the null and alternative hypotheses. 2 O Ho: o 2702 H: 01 Ho: 01 02 キ02 2ァ022 して 2. キ02 2502 2 %3D Find the value of the test statistic. (Round your answer to two decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value %3D State your conclusion. O Reject Ho: We can conclude that there is a difference in the variability of golf scores for male and female professional golfers. O…A Gallup Poll of 800 adults showed that 510 adults are opposed to high school students attending school year-round without the traditional summer break. We want to test that more than 60% of all adults oppose year-round school. Use a significance level of a = 0.05. Check all of the conditions that are needed for this test. O 10% Condition O Normality Assumption O Independence Assumption Randomization Condition Success / Failure Condition O Dependence Assumption O Sample Size AssumptionA 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?
- Report an appropriate hypothesis test and use a 5% significance level. The alternative hypothesis for the One-way Anova F-test would be Group of answer choices Ha: Density affects firing temperature. Ha: Firing temperature affects density. Ha: Firing temperature does not affect density. Ha: Density does not affect firing temperature.In a random sample of males, it was found that 21 write with their left hands and 210 do not. In a random sample of females, it was found that 56 write with their left hands and 440 do not. Use a 0.05 significance level to test the claim that the rate of left-handedness among males is less than that among females. Identify the test statistic. and p valueA small p-value means that the probability of obtaining a sample mean more extreme than the one observed is low under the null. True or False?
- For a one-tailed (upper tail) hypothesis test with a sample size of 26 and a .01 level of significance, the critical value of the test statistic t isIn a random sample of 1000 adult Americans, 700 indicated that they oppose the reinstatement of a military draft. Is there convincing evidence that the proportion of American adults who oppose the reinstatement of the draft is different from two-thirds? Significance level, α= 0.01 state hypothesis z value p-value decision conclusionThe Genetics and IVF Institute conducted a clinical trial of the YSORT method designed to increase the probability of conceiving a boy. As of this writing, 291 babies were born to parents using the YSORT method, and 239 of them were boys. Use significance level to test the claim that the YSORT method is effective in increasing the likelihood that a baby will be a boy. Make an interpretation of your decision in the context of the claim. What is Type 1 error in this problem? Explain its consequence in the context of the problem. Use the sample data to construct a 98% confidence interval estimate of the proportion of boys ( . What does the confidence interval suggest about the claim that the YSORT method is effective in increasing the likelihood that a baby will be a boy
- ANOVA is used for comparing across 3 or more groups.In ANOVA, the null hypothesis is always: at least one variance is different. at least one mean is different. all means are equal. all variances are equalHistorically, the percentage of U.S. residents who support stricter gun control laws has been 55%. A recent Gallup Poll of 2500 people showed 1723 in favor of stricter gun control laws . Assume the poll was given to a random sample of people. QUESTION Test the claim that the proportion of those favoring stricter gun control has changed from 0.55. Perform a hypothesis test, using a significance level of 0.01. What is the probability of Z obt? (round to the nearest hundredth)