Reynir examines the difference in the amount of carbon dioxide in two types of mineral water. He performs a two-group t-test to compare the average carbon dioxide levels in the two groups. His hypotheses are H0 : μ1 - μ2 = 0 og H1 : μ1 - μ2 ≠ 0. Reynir also calculated a confidence interval for the difference between the means of the two groups α and in the hypothesis test). Reynir rejected the null hypothesis. Which of the following applies to the safety margin calculated by Reynir? a) It contains the value zero. b) It contains 95% of the values that can occur when the experiment is performed. c) It does not contain the value zero. d) It contains both values greater than zero and values less than zero

I keep getting different answers for this so I'm checking

16% of all Americans suffer from sleep apnea. A researcher suspects that a lower percentage of those who live in the inner city have sleep apnea. Of the 398 people from the inner city surveyed, 52 of them suffered from sleep apnea. What can be concluded at the level of significance of αα = 0.01? For this study, we should use    Z TEST FOR A POPULATION PROPORTION The null and alternative hypotheses would be:     Ho: P=0.15            (please enter a decimal)    H1: P <0.1 3. The test statistic _z__ = _______  (please show your answer to 3 decimal places.) 4. The p-value = __0.0144__ (Please show your answer to 4 decimal places.) 5. The p-value is  __<__α 6. Based on this, we should  ___FAIL TO REJECT___    the null hypothesis. Thus, the final conclusion is that ... The data suggest the populaton proportion is significantly smaller than 16% at αα = 0.01, so there is sufficient evidence to conclude that the population proportion of inner city residents who have sleep apnea is…

A group of toxicologists investigated the impact of exposure to low oxygen on the mortality of rice weevils. In an experiment, 31,386 of 31,421 rice weevils were found dead after exposure to nitrogen gas for 4 days. In a second experiment, 23,516 of 23,676 rice weevils were found dead after exposure to nitrogen gas for 3.5 days. Conduct a test of hypothesis to compare the mortality rates of adult rice weevils exposed to nitrogen at the two exposure times. Is there a significant difference (at a = 0.10) in the mortality rates? Give the null and alternative hypotheses. Let p, represent the proportion of rice weevils found dead in the first experiment and p, represent the proportion of rice weevils found dead in the second experiment. Choose the correct answer below. O A. Ho: (P1 - P2) #0 Ha: (P1 - P2) = 0 O C. Họ: (P1 - P2) 0 H3: (P1 - P2) = 0 OF. Ho: (P1 - P2) =0 H: (P1 - P2) >0 Find the test statistic. The test statistic is z=. (Round to two decimal places as needed.)

Only 15% of registered voters voted in the last election. Will voter participation increase for the upcoming election? Of the 363 randomly selected registered voters surveyed, 58 of them will vote in the upcoming election. What can be concluded at the αα = 0.01 level of significance? For this study, we should use Select an answer t-test for a population mean z-test for a population proportion  The null and alternative hypotheses would be:       H0:H0:  ? μ p  Select an answer > < ≠ =  (please enter a decimal)     H1:H1:  ? μ p  Select an answer = < ≠ >  (Please enter a decimal) The test statistic ? t z  = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is ? > ≤  αα Based on this, we should Select an answer accept reject fail to reject the null hypothesis. Thus, the final conclusion is that ... The data suggest the population proportion is not significantly higher than 15% at αα = 0.01, so there…

Only 16% of registered voters voted in the last election. Will voter participation increase for the upcoming election? Of the 327 randomly selected registered voters surveyed, 56 of them will vote in the upcoming election. What can be concluded at the αα = 0.05 level of significance? For this study, we should use: z-test for a population proportion or t-test for a population mean  The null and alternative hypotheses would be:       H0:H0:  ? μ p  Select an answer ≠ < = >   (please enter a decimal)     H1:H1:  ? p μ  Select an answer > = ≠ <   (Please enter a decimal) The test statistic ? z or t  =  (please show your answer to 3 decimal places.) The p-value =  (Please show your answer to 4 decimal places.) The p-value is ? > ≤  αα Based on this, we should Select an answer:  accept, reject or fail to reject  the null hypothesis. Thus, the final conclusion is that ... The data suggest the population proportion is not significantly higher than 16% at αα = 0.05, so there…

You are conducting a study to see if the proportion of voters who prefer the Democratic candidate is significantly smaller than 58% at a level of significance of αα = 0.01. According to your sample, 43 out of 85 potential voters prefer the Democratic candidate. For this study, we should use     The null and alternative hypotheses would be:     Ho:           (please enter a decimal)    H1:           (Please enter a decimal) The test statistic     = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is     αα Based on this, we should      the null hypothesis. Thus, the final conclusion is that ... The data suggest the population proportion is not significantly smaller than 58% at αα = 0.01, so there is sufficient evidence to conclude that the proportion of voters who prefer the Democratic candidate is equal to 58%. The data suggest the populaton proportion is significantly smaller than 58% at αα = 0.01, so there is…