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PSY Midterm Uutz Fall 2014 +1.96 and -1.96. If the 2-score for the sample data is...
Please explain in steps, Thank You!! 7. What z-score value separates the highest 10% of the...
Please explain in steps, Thank
You!!
7. What z-score value separates the highest 10% of the scores in a normal distribution from the lowest 90%? 8. Scores on the SAT form a normal distribution with a mean of μ-550 with σ 100. If the state college only accepts students who score in the top 65% on the SAT, what is the minimum score needed to be accepted? What does that z-score become if they change their criteria so that only...
You are conducting a two-tailed hypothesis test to see if your sample mean (x̄) differs significantly...
You are conducting a two-tailed hypothesis test to see if your sample mean (x̄) differs significantly from your population mean (μ = 50). Your alpha level is 0.05 (α = 0.05). Sample data: 53, 56, 59, 64, 55, 42, 36, 58, 39, 53, 62, 60, 64, 53, 42, 53, 65, 60, 61, 63 You will need to: h) State your alternative hypothesis and null hypothesis i) Calculate the sample mean (x̄) j) Calculate the sample standard deviation (s) k) Calculate...
_ 9) In a sample of 10 randomly selected women, it was found that their mean height was 634 inches. From previous...
_ 9) In a sample of 10 randomly selected women, it was found that their mean height was 634 inches. From previous studies, it is assumed that the standard deviation, , 124 inches and that the population of height measurements is normally distributed a) Construct the confidence interval for the population mean height of women b) If the sample size was doubled to 20 women, what will be the effect on the confidence interval? 10) 10) The numbers of advertisements...
For a random sample of 36 data pairs, the sample mean of the differences was 0.72....
For a random sample of 36 data pairs, the sample mean of the differences was 0.72. The sample standard deviation of the differences was 2. At the 5% level of significance, test the claim that the population mean of the differences is different from 0. (a) Is it appropriate to use a Student's t distribution for the sample test statistic? Explain. No, the sample size is not larger than 30. Yes, the sample size is larger than 30. No, the...
#2 sample means, and find the mean of this distribution of sample means How does it...
#2
sample means, and find the mean of this distribution of sample means How does it compare to the mean of the population? Exercise 2. The distribution of walking times for babies has a mean of μ-14 months and a standard deviation of σ-3 months. What is the distribution of sample means for samples of size n = 36? Exercise 3. For the problem considered in section 8.3, assume we got M15. What is the s-score, and do we eject...
/courses/1631958/q 2791378/take D Question 5 12 pts Pulse Rates of Men. A simple random sample of...
/courses/1631958/q 2791378/take D Question 5 12 pts Pulse Rates of Men. A simple random sample of 40 men results in a standard deviation of 10.3 beats per minute (based on the data set provided). The normal range of pulse rates of adults is typically given as 60 to 100 beats per minute. If the range rule of thumb is applied to that normal range, the result is a standard deviation of 10 beats per minute. Use the sample results with...
the average of numbers and then Standard deviation In 2018, the national average SAT score was...
the average of numbers and then Standard deviation
In 2018, the national average SAT score was 1067. Using the sample of 72 observations, we want to test whether the average SAT for ECO 2200 students is different from the national average. Given a .05 significance level, what is the test statistic? (Hint, in Excel, the standard error -STDEV.S/SQRT(n)) Select one: a. t 1.645 b. t 1.96 c. t 2.57 d. t 4.79 3 What do you conclude from the hypothesis...
For the other set of quantitative data, use sample mean and sample standard deviation (from Project 2 or find again), a...
For the other set of quantitative data, use sample mean and sample standard deviation (from Project 2 or find again), and test a claim about the Population Mean (you will need to make the Claim, then use hypothesis testing to see how the data supports/rejects your claim or (fails to do so). Min Wage Per State Descriptive Statistics Mean 8.94 Standard Error 0.24 Median 8.60 Mode 7.25 Standard Deviation 1.69 Sample Variance 2.85 Kurtosis -0.28 Skewness 0.68 Range 6.50 Minimum...
1. Consider the following sample data: (2, 5,12,19,21,25, 38, 52,65, 69, 99). Calculate the following using...
1. Consider the following sample data: (2, 5,12,19,21,25, 38, 52,65, 69, 99). Calculate the following using appropriate symbols when possible. a. Mean: X1 b. Median: 25 34 Standard Deviation: S : 30, 8 d. Variance: S 94 . Ч1 e. Range: q f. Midrange: 5 g. Q1 12 h. Q2: 25 i. Q3: 65 j. Lower fourth: 12 k. Upper fourth: &S I. Fourth spread: Ls-12 m. 1QR: 53 n. Coefficient of Variation: £. 30. 28 0,832 83, 2 37
The following is a set of data from a sample of size n( n=7): 16 ,...
The following is a set of data from a sample of size n( n=7): 16 , 7 , 2, 2 , 10, 11, -6. 1) Find the mean of the data set A) 7 B) 7.28 C) 6 D) 2 2) Find the mode of the data set A) 6 B) 2 C) 7 D) 7.28 3) Find the standard deviation of the data set A) 53 B) 7.28 C) 6.74 D) 318 4) The five-number summary of the data...
Please explain in steps, Thank
You!!
7. What z-score value separates the highest 10% of the scores in a normal distribution from the lowest 90%? 8. Scores on the SAT form a normal distribution with a mean of μ-550 with σ 100. If the state college only accepts students who score in the top 65% on the SAT, what is the minimum score needed to be accepted? What does that z-score become if they change their criteria so that only...
_ 9) In a sample of 10 randomly selected women, it was found that their mean height was 634 inches. From previous studies, it is assumed that the standard deviation, , 124 inches and that the population of height measurements is normally distributed a) Construct the confidence interval for the population mean height of women b) If the sample size was doubled to 20 women, what will be the effect on the confidence interval? 10) 10) The numbers of advertisements...
For a random sample of 36 data pairs, the sample mean of the differences was 0.72. The sample standard deviation of the differences was 2. At the 5% level of significance, test the claim that the population mean of the differences is different from 0. (a) Is it appropriate to use a Student's t distribution for the sample test statistic? Explain. No, the sample size is not larger than 30. Yes, the sample size is larger than 30. No, the...
#2
sample means, and find the mean of this distribution of sample means How does it compare to the mean of the population? Exercise 2. The distribution of walking times for babies has a mean of μ-14 months and a standard deviation of σ-3 months. What is the distribution of sample means for samples of size n = 36? Exercise 3. For the problem considered in section 8.3, assume we got M15. What is the s-score, and do we eject...
/courses/1631958/q 2791378/take D Question 5 12 pts Pulse Rates of Men. A simple random sample of 40 men results in a standard deviation of 10.3 beats per minute (based on the data set provided). The normal range of pulse rates of adults is typically given as 60 to 100 beats per minute. If the range rule of thumb is applied to that normal range, the result is a standard deviation of 10 beats per minute. Use the sample results with...
the average of numbers and then Standard deviation
In 2018, the national average SAT score was 1067. Using the sample of 72 observations, we want to test whether the average SAT for ECO 2200 students is different from the national average. Given a .05 significance level, what is the test statistic? (Hint, in Excel, the standard error -STDEV.S/SQRT(n)) Select one: a. t 1.645 b. t 1.96 c. t 2.57 d. t 4.79 3 What do you conclude from the hypothesis...
1. Consider the following sample data: (2, 5,12,19,21,25, 38, 52,65, 69, 99). Calculate the following using appropriate symbols when possible. a. Mean: X1 b. Median: 25 34 Standard Deviation: S : 30, 8 d. Variance: S 94 . Ч1 e. Range: q f. Midrange: 5 g. Q1 12 h. Q2: 25 i. Q3: 65 j. Lower fourth: 12 k. Upper fourth: &S I. Fourth spread: Ls-12 m. 1QR: 53 n. Coefficient of Variation: £. 30. 28 0,832 83, 2 37
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