Homework Answers
(a)
From given information:
(b)
We are 99% confident that true difference in proportion of parents who condone slapping in 2015 compared to 2000 lie in the above interval.
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5. A random sample of parents from a population was questioned in 2000 and a second...
A random sample of n = 200 observations from a binomial population produced x = 190...
A random sample of n = 200 observations from a binomial population produced x = 190 successes. Find a 90% confidence interval for p. (Round your answers to three decimal places.) _______ to _______ Interpret the interval. 90% of all values will fall within the interval. There is a 10% chance that an individual sample proportion will fall within the interval. There is a 90% chance that an individual sample proportion will fall within the interval. In repeated sampling, 90%...
A random sample of n = 500 observations from a binomial population produced x = 220...
A random sample of n = 500 observations from a binomial population produced x = 220 successes. (a) Find a point estimate for p. Find the 95% margin of error for your estimator. (Round your answer to three decimal places.) (b) Find a 90% confidence interval for p. (Round your answers to three decimal places.) _____to_____ Interpret this interval. a. In repeated sampling, 10% of all intervals constructed in this manner will enclose the population proportion. b. In repeated sampling,...
5. A simple random sample of size n is drawn from a population that is known...
5. A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s, is determined to be 9.1. Construct and interpret a 90% confidence interval for o if the sample size, n, is 14. Show formula and final answer to two decimal places. O (6.94, 13.52) O (2.30, 3.68) O (48.15, 182.71) O (5.29.20.08)
Question 5 4 pts A random sample of size 200 was selected from a pool of...
Question 5 4 pts A random sample of size 200 was selected from a pool of university students and they were asked whether they use Facebook on a regular basis. Eighty replied yes. What would be your 90% confidence interval estimate of the population proportion of regular Facebook users based upon the given information? (Hint: use 1.65 as the critical z-value) O [46.5%, 53.5%] O [42.5%, 57.5%] O [48.5%, 51.5%] [34.3%, 45.7%)
5. I took a random sample of people from the 2000 U.S. Census and recorded the...
5. I took a random sample of people from the 2000 U.S. Census and recorded the incomes. The sample size was n = 30 (with replacement). The average of the sample was $23606 and the standard deviation of the sample was $24757. Answer these questions using the statistics that I found from my sample. a) Find a 95% confidence interval for the mean income of the population. b) What assumptions must you make? c) Your confidence interval is of the...
1. A random sample of n measurements was selected from a population with standard deviation σ=13.6...
1. A random sample of n measurements was selected from a population with standard deviation σ=13.6 and unknown mean μ. Calculate a 90 % confidence interval for μ for each of the following situations: (a) n=45, x¯¯¯=89.8 ≤μ≤ (b) n=70, x¯¯¯=89.8 ≤μ≤ (c) n=100, x¯¯¯=89.8 ≤μ≤ (d) In general, we can say that for the same confidence level, increasing the sample size the margin of error (width) of the confidence interval. (Enter: ''DECREASES'', ''DOES NOT CHANGE'' or ''INCREASES'', without the...
A random sample of 49 measurements from a population with population standard deviation o 3 had...
A random sample of 49 measurements from a population with population standard deviation o 3 had a sample mean of x, 9. An independeent random sample of sample mean of x, 11. Test the claim that the population means are 64 measurements from a second population with population standard deviation a2 4 had different. Use level of significance 0.01. (a) What distribution does the sample test statistic follow? Explain. The student's t. We assume that both population distributions are approximately...
The following data represent the pH of rain for a random sample of 12 rain dates, A normal probability plot suggests the data could come from a population that is normaly distributed. A boxplot indic...
The following data represent the pH of rain for a random sample of 12 rain dates, A normal probability plot suggests the data could come from a population that is normaly distributed. A boxplot indicates there are no outliers. Complete parts (a) through (d) below. 5.20 5.02 4.87 5.72 4.57 4.76 4.89 474 4.56 4.80 5.19 5.30 (a) Determine a point estimate for the population mean. A point estimate for the population mean is Round to two decimal places as...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male t...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male teachers. She picks a random sample by picking a random sample of schools, in the schools picked, picking a random sample of departments, and in the departments picked, picking a random sample of teachers. What kind of sampling was performed? d) voluntary response e) cluster b) stratified Random...
question #24 313 7-1 Estimating a Population Proportion <p 174% sult from part (a)tothis 95% onfidence iterval for 5 subjects who she 45 sutycts given a placebo instead of OyContin: 1.93% <...
question #24
313 7-1 Estimating a Population Proportion <p 174% sult from part (a)tothis 95% onfidence iterval for 5 subjects who she 45 sutycts given a placebo instead of OyContin: 1.93% < ρ a. developed y When she was 9 years of age, Emily Rosa did a science fair experimem sed professional souch therapists to see if they could sense her energy fieldhe be tn select either her right hand or her left hand, and then she asked the therapist...
5. A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s, is determined to be 9.1. Construct and interpret a 90% confidence interval for o if the sample size, n, is 14. Show formula and final answer to two decimal places. O (6.94, 13.52) O (2.30, 3.68) O (48.15, 182.71) O (5.29.20.08)
Question 5 4 pts A random sample of size 200 was selected from a pool of university students and they were asked whether they use Facebook on a regular basis. Eighty replied yes. What would be your 90% confidence interval estimate of the population proportion of regular Facebook users based upon the given information? (Hint: use 1.65 as the critical z-value) O [46.5%, 53.5%] O [42.5%, 57.5%] O [48.5%, 51.5%] [34.3%, 45.7%)
A random sample of 49 measurements from a population with population standard deviation o 3 had a sample mean of x, 9. An independeent random sample of sample mean of x, 11. Test the claim that the population means are 64 measurements from a second population with population standard deviation a2 4 had different. Use level of significance 0.01. (a) What distribution does the sample test statistic follow? Explain. The student's t. We assume that both population distributions are approximately...
The following data represent the pH of rain for a random sample of 12 rain dates, A normal probability plot suggests the data could come from a population that is normaly distributed. A boxplot indicates there are no outliers. Complete parts (a) through (d) below. 5.20 5.02 4.87 5.72 4.57 4.76 4.89 474 4.56 4.80 5.19 5.30 (a) Determine a point estimate for the population mean. A point estimate for the population mean is Round to two decimal places as...
TEST 1: ANSWERS INTS EACH). This section takes around 5 minutes. Name Spring 2019 8) A researcher wants to determine whether female teachers give higher or lower grades, on average, then male teachers. She picks a random sample by picking a random sample of schools, in the schools picked, picking a random sample of departments, and in the departments picked, picking a random sample of teachers. What kind of sampling was performed? d) voluntary response e) cluster b) stratified Random...
question #24
313 7-1 Estimating a Population Proportion <p 174% sult from part (a)tothis 95% onfidence iterval for 5 subjects who she 45 sutycts given a placebo instead of OyContin: 1.93% < ρ a. developed y When she was 9 years of age, Emily Rosa did a science fair experimem sed professional souch therapists to see if they could sense her energy fieldhe be tn select either her right hand or her left hand, and then she asked the therapist...
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