Jse the given information to find the number of degrees of freedom, the critical values x and x, and the confidence interva estimate of o. It is reasonable to assume that a simple random sample has been selected from a population with a normal distribution. Nicotine in menthol cigarettes 90% confidence, n = 26, s 0.29 mg. Click the icon to view the table of Chi-Square critical values. df = (Type a whole number)
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- SHOW ALL WORK. Interpret confidence intervals and explain the conclusions from hypothesis tests. For all hypothesis tests, clearly state the null and alternative hypotheses, the significance level, the test statistic, the p-‐value, and your conclusion. If you are using a t-statistic, clearly note how many degrees of freedom you have. 1. Consider the following data collected regarding infant blood pressure, age, and birth weight: i Birth weight in oz. (x1) Age in days (x2) Systolic Blood Pressure mmHg (y) 1 135 3 89 2 120 4 90 3 100 3 83 4 105 2 77 5 130 4 92 6 125 5 98 7 125 2 82 8 105 3 85 9 120 5 96 10 90 4 95 11 120 2 80 12 95 3 79 13 120 3 86 14 150 4 97 15 160 3 92 16 125 3 88 A. Interpret the corresponding 95% confidence intervals for both Birth weight and Age. B. What is the predicted average SBP of an infant born with birth weight 8lbs (128oz) measured at 3 days old? C. Calculate the Pearson correlation between Age and Birth weight, and test if this correlation is…You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8. While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 93.5%.What is the value of the test statistic? Find the p-value What is the appropriate conclusion at α=0.10? do not round please
- A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s = 14.7 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. subjects. (Round up to the nearest subject.) subjects. (Round up to the nearest subject.) A 99% confidence level requires A 95% confidence level requires How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level increases the sample size needed. B. The sample size is the same for all levels of confidence. OC. Decreasing the confidence level decreases the sample size needed. ...all 3 parts pleaseFind the margin of error for the given values of c, o, and n. c = 0.95, o = 2.2, n = 81 E= Click the icon to view a table of common critical values. (Round to three decimal places as needed.) Table of Common Critical Values Level of Confidence 90% 95% 99% Print Zc 1.645 1.96 2.575 Done
- Use the given confidence level and sample data to find a confidence interval for the population standard deviation o. Assume that a simple random sample has been selected from a population that has a normal distribution. Salaries of college professors who took a philosophy course in college 90% confidence; n= 51, x= $56,300, s = $18,054 E Click the icon to view the table of Chi-Square critical values. $People were polled on how many books they read the previous year. Initial survey results indicate that s = 11.9 books. Complete parts (a) through (d) below. A Click the icon to view a partial table of critical values. (a) How many subjects are needed to estimate the mean number of books read the previous year within six books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (b) How many subjects are needed to estimate the mean number of books read the previous year within three books with 95% confidence? This 95% confidence level requires subjects. (Round up to the nearest subject.) (c) What effect does doubling the required accuracy have on the sample size? O A. Doubling the required accuracy nearly halves the sample size. O B. Doubling the required accuracy nearly doubles the sample size. O C. Doubling the required accuracy nearly quarters the sample size. O D. Doubling the required accuracy nearly quadruples the sample size. (d)…Researchers studied the mean egg length (in millimeters) for a bird population. After taking a random sample of eggs, they obtained a 95% confidence interval of (45,60). What is the value of the margin of error? Choose the correct answer below. A. 15 mm B. 52.5 mm O c. 7.5 mm O D. 1.96Application Exercise: Dr. Butler is interested in the preference for dog breeds among college students. She collected the observed frequencies below and wants to know if the breeds are equally preferred. What can be concluded with an a of 0.05? Irish Setter Golden Retriever Papillon Great Dane 101 94 135 97 L What is the appropriate test statistic? -Select Compute the statistic selected in : M Obtain/compute the appropriate values to make a decision about Hg. Critical Value = | J: Test Statistic = Decision: -Select- N Compute the corresponding effect size(s) and indicate magnitude(s). If not appropriate, input and/or select "na" below. Effect Size = | ]: Magnitude: -Select-- Make an interpretation based on the results. O There is a significant relationship between dog breeds and college students. There is a significant dog breed preference among college students. O Dog breeds are equally preferred among college students.The average expenditure per student for a certain school year was $10,550 with a population standard deviation of $1600. A survey for the next school year of 100 randomly selected students resulted in a sample mean of $11000. Do these results indicate that the average expenditure has changed? use α = 0.01 a/ state the hypothesis b/ find the critical value(s) c/ find the test value d/ make a decision e/ write the summary