use an x^2 test to test the clain o^2 = 0.53 at the a=0.10 signifigance level using sample statistics s^2 = 0.495 and n=18. assume the population is normally distributed
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use an x^2 test to test the clain o^2 = 0.53 at the a=0.10 signifigance level using sample statistics s^2 = 0.495 and n=18. assume the population is
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- The average retirement age in America is 65 years old. Do small business owners retire at an older average age? The data below shows the results of a survey of small business owners who have recently retired. Assume that the distribution of the population is normal. 71, 61, 60, 60, 71, 62, 66, 70, 71, 63, 63, 58 What can be concluded at the the αα = 0.05 level of significance 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 > < = ≠ H1:H1: ? p μ Select an answer < > = ≠ The test statistic ? z 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 fail to reject accept reject the null hypothesis. Thus, the final conclusion is that ... The data suggest the…The processing times for cases at a certain office follow a bell-shaped model with mean 124 days and standard deviation 33 days. The processing time for a certain case was 179 days. Was this a typical processing time or was it unusually long? Typical, because it is less than 3 standard deviations away from the mean. O Unusually long, because it is more than 1 standard deviation away from the mean. Unusually long, because it is less than 3 standard deviations away from the mean. Unusually long, because it is not more than 2 standard deviations away from the mean. Typical, because it is not more than 2 standard deviations away from the mean. Typical, because it is more than 1 standard deviation away from the mean.Listed in the data table are amounts of strontium-90 (in millibecquerels, ormBq, per gram of calcium) in a simple random sample of baby teeth obtained from residents in two cities. Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. City_#1 City_#2 100 117 86 61 121 100 119 85 101 89 104 107 213 110 116 111 290 142 100 133 283 101 145 209 The test statistic is The P-value is construct a confidence interval suitable for testing the claim that the mean amount of strontium-90 from city #1 residents is greater than the mean amount from city #2 residents. ____mBq<μ1−μ2<____mBq
- 200 patients involves 200 particpants in comparing an experimental medication to a placebo. Each person enrolled is randomized to recieve either the experimental medication or placebo. Data is collected at the end of the study after 6 weeks. Test if there is significant difference in mean systolic blood pressures between grouos using a=0.05. Meqn of 174 standard deviation of 19.5 Mean systolic blood pressure: experimental (n= 100) 120.2 (15.4) placebo (100) 131.4 (18.9) Hypertensive (%) exp. 14 placebo 22 Side effects (%) exp. 6 placebo 8The life span of a component is known to be distributed as normal with standard deviation 40 hours. It is claimed that the mean life span such components is 800 hours. If a random sample of 25 components produces a mean of 782 hours, does the data support that the mean life is different form 800 hours? Test at level of significant of 0.05 and 0.01 using a) critical region b) p-valuesIn order to evaluate a spectrophotometric method for the determination of titanium concentration, the method was uased on 64 alloy samples containing different certified amounts of titanium. For each alloy, eight different concentrations of titanium were made. Additionally, two spectrophotometer machines were used in the lab to control for possible variation between machines. Each machine received a random allocation of each concentration of alloy. Below you will find an ANOVA analysis for difference in certified mean concentrations detected using machines as a blocking fator. (You will have to calculate some of the values in the tables marked with ). Concentration 1.93 Machine 0.16 Residuals 14.27 Which one of the following is correct given the ANOVA table (using a 5% level of significance)? A. The method was able to detect the difference in the concentrations of titanium alloys; additionally, there was a detectable difference in the mean concentration between machines.…
- The average retirement age in America is 62 years old. Do small business owners retire at a different average age? The data below shows the results of a survey of small business owners who have recently retired. Assume that the distribution of the population is normal. 69, 62, 73, 55, 74, 56, 60, 65, 75, 59, 66, 57, 61, 68 What can be concluded at the the αα = 0.01 level of significance level of significance? For this study, we should use Correct The null and alternative hypotheses would be: H0:H0: Correct Correct Correct H1:H1: Correct Correct Correct The test statistic Correct = Incorrect (please show your answer to 3 decimal places.) The p-value = Incorrect (Please show your answer to 4 decimal places.) The p-value is Correct αα Based on this, we should Correct the null hypothesis. Thus, the final conclusion is that ... The data suggest the populaton mean is significantly different from 62 at…Many college graduates who are employed full-time have longer than 40-hour work weeks. Suppose that we wish to estimate the mean number of hours, u, worked per week by college graduates employed full-time. We'll choose a random sample of college graduates employed full-time and use the mean of this sample to estimate u. Assuming that the standard deviation of the number of hours worked by college graduates is 6.20 hours per week, what is the minimum sample size needed in order for us to be 95% confident that our estimate is within 1.2 hours per week of u? Carry your intermediate computations to at least three decimal places. Write your answer as a whole number (and make sure that it is the minimum whole number that satisfies the requirements). (If necessary, consult a list of formulas.)Please help solve
