Refer to the accompanying data display that results from a sample of airport data speeds in Mbps. Complete parts (a) through (c) below. TInterval (13.046,22.15) X= 17.598 Sx = 16.01712719 n= 50 a. Express the confidence interval in the format that uses the "less than" symbol. Given that the original listed data use one decimal place, round the confidence interval limits accordingly. 13.05 Mbps < u< 22.15 Mbps (Round to two decimal places as needed.) b. Identify the best point estimate of u and the margin of error. The point estimate of u is Mbps. (Round two decimal places as needed.)

A developmental psychologist believes that children’s self-esteem scores change with age. She measures N=8 children’s self-esteem in 3rd grade and again in 6th. Evaluate the results of her data using α = .052tail. **Attached Image** a. Show how the 95% confidence interval was calculated. b. State the conclusion in APA format. c. What is Cohen’s d?

Find the following. Enter your answer rounded to at least two decimals. Z(a/2) for the 95% confidence interval

A random sample of students taking STAT 201 this semester was pulled.  Among other things, the survey asked the number of hours the student spent studying for the final exam.  StatCrunch was used to create the output for a 95% confidence interval estimate for the population mean number of hours students spend studying for the final exam. 95% confidence interval results: Variable Sample Mean Std. Err. DF L. Limit U. Limit # hours 6.05 0.31 64 5.42 6.67   Give the value of the point estimate used to calculate the confidence interval. (Do not round your answer)

A poll was conducted that asked 1015 people how many books they had read in the past year. Results indicated that x= 14.3 books and s= 16.6 books. Construct a 90% confidence interval for the mean number of books people read. E Click the icon to view the table of areas under the t-distribution, Construct a 90% confidence interval for the mean number of books people read. ) (Use ascending order. Round to two decimal places as needed.)

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A clinic measured the systolic blood pressure for a random sample of 10 patients. The resulting 95% confidence interval for the mean systolic blood pressure of all the patients at this clinic was (111.3, 129.5). What was the mean systolic blood pressure from the sample of 10 patients? 18.2 111.3 120.4 129.5

Karen wants to advertise how many chocolate chips are in each Big Chip cookie at her bakery. She randomly selects a sample of 78 cookies and finds that the number of chocolate chips per cookie in the sample has a mean of 19.3 and a standard deviation of 2.1.   Find a 80% confidence interval for the number of chocolate chips per cookie for Big Chip cookies?   Round your answers to one decimal place.

You measure 22 textbooks' weights, and find they have a mean weight of 53 ounces. Assume the population standard deviation is 7.9 ounces. Based on this, construct a 90 % confidence interval for the true population mean textbook weight. Give your answers as decimals, to two places εμε