Two random samples are selected from two independent populations. A summary of the samples sizes, sample means, and sample standard deviationsis given below:ni = 45, š = 55.2, s1 = 5.6n2 = 42, 2 = 79.3,$2 = 10.8Find a 92% confidence interval for the difference u - H2 of the means, assuming equal population variances.Confidence Interval =

Given: Sample size of two independent population is n1=45 and n2=42. Sample mean of two independent…

Two random samples are selected from two independent populations. A summary of the samples sizes, sample means, and sample standard deviations is given below: n¡ = 45, i = 55.2, S = 5,6 n2 = 42, z = 79.3, $2 = 10.8 Find a 92% confidence interval for the difference u - 42 of the means, assuming equal population variances. Confidence Interval =

Two random samples are selected from two independent populations. A summary of the samples sizes, sample means, and sample standard deviations is given below: n¡ = 45, i = 55.2, S = 5,6 n2 = 42, z = 79.3, $2 = 10.8 Find a 92% confidence interval for the difference u - 42 of the means, assuming equal population variances. Confidence Interval =

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Construct a confidence interval for the ratio of the population variances given the following sample statistics. Round your answers to four decimal places. n1=9, n2=18, s1^2/s2^2=1.17, a=0.1
A sample of size 50 from a normal distribution has sample mean 5 and sample variance 20. Find 96% confidence intervals for the variance and standard deviation of the distribution.
What value of z would you use to calculate the 98% confidence interval for a population mean, given that you know the population standard deviation, the sample size and the sample mean of your sample?
Sales personnel for Skillings Distributors submit weekly reports listing the customer contacts made during the week. A sample of 85 weekly reports showed a sample mean of 18.5 customer contacts per week. The sample standard deviation was 5.4. Provide 90% and 95% confidence intervals for the population mean number of weekly customer contacts for the sales personnel. 90% confidence interval, to 2 decimals: 95% confidence interval, to 2 decimals:
Suppose that we are interested in comparing the academic success of college students who belong to fraternal organizations and the academic success of those who do not belong to fraternal organizations. Random samples of size 40 are taken from each population where the variances and standard deviations are known. Sample Size Mean GPA Variance (2) 2.03 2.21 Fraternity member (f): 40 Nonmembers (n): 40 .46 .35 Construct a 96% confidence interval estimate for the difference between the mean GPAS (uf- un). Interpret this interval estimate. What can you conclude about the mean GPAs of the two groups?
Seven acute schizophrenics and 10 chronic schizophrenics have been measured on a clarity of thinking scale. The mean for the acute sample was 52, with s = 12, and the mean for the chronic sample was 44, with s = 11. Perform a pooled-variance t test with alpha = .05 (two-tailed), and state your statistical conclusion.
identify the test statistic, p value, and confidence interval
Suppose that you conducted a study of 150 elementary school students. You wanted to find out if they were homeschooling, hybrid learning, or full-time schooling in Spring 2020 and Fall 2020. The following are the results. Spring Full- Time Spring Spring Total Homeschool Hybrid Fall 30 18 48 Homeschool Fall Hybrid 14 43 3 60 Fall Full 17 16 42 Time Total 61 77 12 150 Use the contingency table to answer the following questions. Show all of your work using fractions. You may use a calculator to calculate the final answer. Round to three decimal places. a. What is the probability that a student was in home school in the Fall? b. What is the probability that a student was in home school in Fall or Spring? c. What is the probability the student was in home school in Fall and Spring? d. What is the probability that a student was in home school in Fall given that they were in homeschool in Spring? e. What is the probability that a student was in home school in Spring given that they were in…
Find the value for each ta/2 Prompts Submitted Answers n = 18 for the 99% confidence interval for the Choose a match mean. n = 10 for the 90% confidence interval for the Choose a match mean. n = 15 for the 98% confidence interval for the Choose a match mean.
Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"
Researchers examined the bill color (in hue degree) of male and female zebra finches. Here are the summary statistics from the study. Sex N Mean Standard deviation Males 59 2.91 1.46 Females 60 7.42 2.48 How different are male and female zebra finches in bill color? The margin of error for a 95% confidence interval for the difference in mean bill color μF – μM (in hue degree) is
Researchers from a certain country were interested in how characteristics of the spleen of residents in their tropical environment compare to those found elsewhere in the world. The researchers randomly sampled 91 males and 109 females in their country. The mean and standard deviation of the spleen lengths for the males were 10.9 cm and 0.9 cm, respectively, and those for the females were 9.8 cm and 1.1 cm, respectively. Determine a 95% confidence interval for the difference between mean spleen lengths of males and females in this country. Click here to view page 1 of the table of critical values of t. Click here to view page 2 of the table of critical values of t. Let population 1 be all males in the country and let population 2 be all females in the country. The 95% confidence interval for µ1 - 4½ is ( | D (Round to three decimal places as needed. Use ascending order.)