ssume Certain properties of the cleaning method mean that there is reason to suspect that the standard deviation o is also different when using the new cleaning method. We shall therefore now assu that o is also unknown. From the 16 measurements that gave an average of 19.8, a sample standard deviation of s = 1.9 was obtained. a) Find a 95% confidence interval for g
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- Find a 95% confidence interval of mean chloride concentration when roadway area is 1.0%3. Overproduction of uric acid in the body can be an indication of cell breakdown. Over a period of clam 2 months, an adult male patient has taken eight blood tests for uric acid. The mean concentration was x = 5.35 mg/dl. The distribution of uric acid in healthy adult males can be assumed to be sono normal, with σ = 1.86mg/dl. Find a 95% confidence interval for the population mean concentration of uric acid in this patient's blood. What is the margin of error?Suppose the mean height in inches of all 9th grade students at one high school is estimated. The population standard deviation is 3 inches. The heights of 9 randomly selected students are 63, 64, 68, 73, 64, 65, 73, 70 and 72. I = Ex: 12.34 O Margin of error at 90% confidence level = Ex: 1.23 C 90% confidence interval = [ Ex: 12.34 Ex: 12.34 ] (smaller value, larger value] %3D
- answer for subpart iv) and v) onlyThe brightness of a television picture tube can be evaluated by measuring the amount of current required to achieve a particular brightness level. A sample of 10 tubes results in x = 317.2 and s = 15.7. Find (in microamps) a 99% confidence interval on mean current required. State any necessary assumptions about the underlying distribution of the data.The mean number of eggs per person eaten in the United States is 263. Do college students eat less eggs than the average American? The 62 college students surveyed averaged 260 eggs per person and their standard deviation was 30.3. What can be concluded at the αα = 0.05 level of significance? For this study, we should use The null and alternative hypotheses would be: H0:H0: Correct H1:H1: Correct 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 that the sample mean is not significantly less than 263 at αα = 0.05, so there is statistically insignificant evidence to conclude that the sample mean number of eggs consumed by college students per year is less than 260. The data suggest that the population mean is not…
- A simple random sample of 10 subjects finds that the sample mean is 56 and the standard deviation is 4. Find the 98% confidence interval for u. Display the result in interval notation. You must round your result to decimal places. Remember that the information you have is from a small sample, you must use the t distribution. Remember that critical values can be calculated in EXCEL using the degrees of freedom (n-1) and the level of significance (I - C) as a function of T.INV 2T (Level of Significance, Degrees of Freedom) Select one: a. The interval is: (53,057, 58,943) b. The range is: (53,521, 58,479). c. The interval is: (51,080, 60,920) d. The interval is: (51.991, 60.009) e. The interval is: (52,431, 59,569)The mean IQ for the entire population in any age group is known to be 100 with a standard deviation of 15. Suppose the IQ scores of 72 12th graders in Columbus are measured and the sample mean is found to be 103.4 and the sample standard deviation is 20.2. Do the scores provide good evidence that the mean IQ of this population is not 100? State the null (H0) and alternative (Ha) hypotheses. 2. What are the confidence intervals for this data? 3. What is the value of the test statistic? 4. What is the p-value for this data? 5. What is your decision about the null hypothesis?: Reject Fail to Reject 6. Summarize the conclusion in the context of the problem.The caffeine consumption of a random sample of 50 students showed a mean of 14.4 oz and a standard deviation of 6.3. Construct a 95% confidence interval for the mean ounce of all students. What can we assert with 95% confidence interval about the possible size of our error if we estimate the mean ounce of all students to be 14.4?
- Q2.1 Conditions In a clinical setting it may be prudent to take the blood pressure of cats. Suppose that a random sample of 32 house cats yields a mean systolic blood pressure of 118 mmHg with a standard deviation from the sample of 16 mmHg. You will use the information provided to estimate the mean systolic blood pressure of all house cats at 90% confidence. Part A) State the conditions required to calculate this estimate AND comment on how they were met: Save Answer Q2.2 Mechanics In a clinical setting it may be prudent to take the blood pressure of cats. Suppose that a random sample of 32 house cats yields a mean systolic blood pressure of 118 mmHg with a standard deviation from the sample of 16 mmHg. You will use the information provided to estimate the mean systolic blood pressure of all house cats at 90% confidence. Part B) Mechanics: Write the formula with relevant substitutions and results. Save Answer Q2.3 Intrepet In a clinical setting it may be prudent to take the blood…A random sample of 46 adult coyotes from Northern Minnesota showed the average age to be sample mean of 2.05 years. The population standard deviation is known to be o = 1.13 years. However, it is thought that the average age of coyotes is u = 1.75 years. Test to see if the coyotes in Northern Minnesota live longer than the national average of 1.75 years. Use 0.03 level of significance. What are the hypotheses? A: Ho µ= 1.75 years vs HA µ> 1.75 years B: Ho µ= 1.75 years vs HA H 2.05 years D: Ho µ = 2.05 years vs HA u< 2.05 years O A D O OPlz answer both parts correctly asap
