By comparing Tables Six and Nine, discuss the impacts on the estimation results if heteroskedasticity is p
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By comparing Tables Six and Nine, discuss the impacts on the estimation results if
heteroskedasticity is present.
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- A limousine company is concerned with increasing costs of maintaining their fleet of 150 cars. After testing, the company found that the emissions systems of 9out of the 20 cars they tested failed to meet pollution control guidelines. They had forecasted costs assuming that a total of 54cars would need updating to meet the latest guidelines. Is this strong evidence that more than 36% of the fleet might be out of compliance? Test an appropriate hypothesis and state your conclusion. Be sure the appropriate assumptions and conditions are satisfied before you proceed. What are the null and alternative hypotheses? What is the value of the test statistic? What is the P-value of the test statistic? What is your conclusion?Site images for background. Is there evidence that Square Feet(x1), Price/Square Feet(x2) and Bathrooms(x3) together provide important information for predicting price? in terms of variables xi and parameters Bi, write the NULL and ALTERNATIVE hypotheses. Find the statistics and its corresponding p-value. State your conclusion.2. The city council is considering a law that would ban concealed weapons in all public facilities. A sample has been selected from the community and surveyed about support for the proposed ordinance. Is there a statistically significant relationship between age and support for the law against carrying concealed weapons (use p=.05, χ2(critical) = 3.841)? Use the five step model as a guide and write a sentence or two interpreting your results. Age Under 40 40 and older Support For 142 77 219 Against 106 170 276 248 247 495
- We consider the problem of improving lithium car batteries. A research group is makıng great advances using a new type anode and they claim that the mean life is greater than 1600 recharge cycles. To support this claim, they create 36 new batteries and subject them to recharge cycles until they fail. The claim will be established if the sample mean lifetime is greater than 1640 cycles. Otherwise, the claim will not be established and further improvements are needed. Assume that the population standard deviation o = 192 cycles is known. (a) Find the probability of a Type I error. (b) Find the probability of a Type II error when u = 1680 cycles.According to the ACT Profile Report-National, the ACT composite scores are normally distributed with µ=21.0 and σ=5.4. Many charter schools receive funding from the state government without providing accountability measures as required by the public schools. A sample of 36 high school seniors is randomly selected from charter schools. Their average ACT composite score is 19.8. Is the average ACT composite score of seniors from charter schools lower than 21.0 assuming α=0.05?Suppose that you have created a contingency table comparing the restaurants that students ate at and whether they got food poisoning. You calculate a chi-square value and use it to determine a level a significance for this contingency table. State the null hypothesis that this test would be examining.
- A state agency requires a minimum of 5 parts per million (ppm) of dissolved oxygen in order for the oxygen content to be sufficient to support aquatic life. Six water specimens taken from a river at a specific location during the low-water season (July) gave readings of 4.8, 5.2, 4.8, 4.9, 4.9, and 4.6 ppm of dissolved oxygen. Do the data provide sufficient evidence to indicate that the dissolved oxygen content is less than 5 ppm? Test using ? = 0.05. a) state null and alternate hypotheses b) state the test statistic c) state the rejection region d) state the conclusionIs there a treatment that appears to be most effective in the sandy and dry region?One tree in the study had a weight that exceeded its expected weight (according to the best fit curve) by more than that of any other tree. By how many tons did the trees actual weight exceed the expected weight for its height?
- figure the predicted effect size and indicate whether it is approximately small, medium, or large, for each of the following planned studies (only a, b, and c)!Dr. Castillejo feels that the maximum pulse rate (from 152 bpm to 196 bpm) during the run is a good predictor in explaining the oxygen consumption in the blood stream. He asserts that if the pulse rate at the end of the run increased, then the oxygen consumption will also increase, hence his/her heart is functioning well. Based on the R commanderoutput below, Give the expected oxygen consumption if the maximum pulse rate is 160 bpmSuppose that having a widow's peak was a dominant trait (W) compared to not having a widow's peak (w). In a sample size of 30 students, 15 were observed to have a widow's peak and 15 did not have a widow's peak. The expected frequency of a widow's peak is 75% chance of getting it and a 25% chance of not getting it. Perform a chi square analysis to see if the data above agrees with the predicted outcome.