A psychologist has developed a standardized testfor measuring vocabulary skill for 4 year old children.The scores on the test form a normal distributionwith u = 70 and o = 20. A researcher would like touse the test to investigate the hypothesis thatchildren who grow up as an only child developvocabulary skills at a faster rate than children inlarger families. A sample of n=25 only children isobtained and the mean test score for the sample isM = 77. Perform a two tailed hypothesis test, with analpha level of .05, and add an APA summary.

Given : n=25 , X-bar=77 , σ=20 , μ0=70 , α=0.05 Since , the population standard deviation (σ) is…

Answered: A psychologist has developed a…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The average French person drinks approximately 30 gallons of soda a year. Some French legislators are recommending instituting a sales tax on soda to raise revenue and fight obesity. Will a sales tax reduce the mean amount of soda consumption? Suppose that a sales tax on soda will be added in a random sample of communities to measure the impact on soda consumption. State the null and alternative hypothese Suppose sample results give a p-value of 0.2. State your general conclusion (reject the null or fail to reject the null). Then state your conclusion based on the context of this situation. Now suppose sample results give a p-value of 0.018. State your general conclusion (reject the null or fail to reject the null). Then state your conclusion based on the context of this situation.
A manager states that in his warehouse, the average number of days per year missed by the employees due to illness is less than the national average of twelve. The manager took a sample of 60 employees and found that the mean number of days missed due to illness was 10.1 days. If 0 = 4. 28 and a = 0. 01, determine if there is sufficient evidence to believe the manager's statement Please show all work in performing your hypothesis test below. Be sure to include null and alternative hypotheses, critical value, tes value and your conclusion.
In a neuroscience research lab, the researchers want to know the effects of long-term marijuana use on memory and reaction times. In order to investigate their research hypothesis a sample of 50 long-term marijuana users between the ages of 35-45 were selected with a mean memory and reaction time of 69.4 seconds. The population average for the same age group has a mean of 48 and S.E.M. is 7. Go through the steps of hypothesis testing, select appropriate statistics and state your results, use a=.05.
For all hypothesis testing, you must use the five-step method. You are told that the population mean for the Law School Admissions Test (LSAT) for Canadian students is 429.You want to compare the population of UWO students with Canadian students as a whole with regard to LSAT scores. To find out, you take a random sample of 100 UWO students who have taken the test and find that the sample mean is 462. The population standard deviation is 81. Do UWO students score higher on the LSAT than students from Canada as a whole? You think they do. Use α = .05, and round to three places of the decimal. Interpret your results.
It currently takes users a mean of 26 minutes to install the most popular computer program made by RodeTech, a software design company. After changes have been made to the program, the company executives want to know if the new mean is now different from 26 minutes so that they can change their advertising accordingly. A simple random sample of 37 new customers are asked to time how long it takes for them to install the software. The sample mean is 27.9 minutes with a standard deviation of 7.7 minutes. Perform a hypothesis test at the 0.05 level of significance to see if the mean installation time has changed. Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Họ : 1 = 26 Ha H 26
Researchers conducted a study to determine the effects of different types of alcohol on the peak alcohol concentration. In one part of the study, the researchers gave 15 randomly select males a controlled volume of vodka and monitored the subjects' alcohol concentration following the period of consumption. The legal limit for driving is 80 mg/dL (milligrams per deciliter of blood). A hypothesis test was conducted to see if the mean peak alcohol concentration from drinking vodka was different from the legal driving limit. This was reflected in the null and alternative hypotheses ?0:??1:?=80 mg/dL≠80 mg/dL The researchers required their results to be statistically significant at a level of ?=0.10. The mean peak alcohol concentration of the participants after drinking a controlled volume of vodka was 77.4 mg/dL with a standard deviation of 17.25 mg/dL. Determine the confidence interval that corresponds to the ?‑test. Give the lower and upper bounds precise to two decimal places
The mean number of English courses taken in a two-year time period by male and female college students is believed to be about the same. An experiment is conducted and data are collected from 24 males and 26 females. The males took an average of 4.2 English courses with a standard deviation of 1.1. The females took an average of 3.9 English courses with a standard deviation of 0.7. Conduct a hypothesis test at the 4% level of significance to determine whether the means are statistically the same. Step 1: State the null and alternative hypotheses. Ho: H1 = V H.: H1 – µ2 # v test.) (So we will be performing a two-tailed
On a normal curve, where do most scores fall?
just the test statistic thank you!
A study was being done at our District to see who takes more units per semester, students at Cypress College or students at number of units they took per semester was 13.1 units with a standard deviation of 2.4 units. They randomly selected a sample of 65 Cypress College students and found that the mean number of units they took per semester was 11.6 units with a standard Fullerton College. To test this, the researchers randomly selected 60 Fullerton College students and found that the mean deviation of 3.7 units. Test the claim that the mean number of units is more for Fullerton College students than Cypress College students at the a=0.05 level of significance. Calculator Function [ Select ] [ Select ] X^2-Test T-Test 2-SampFTest 2-PropZTest ANOVA 2-SampT Test [ Select ] sufficient evidence that the mean number of units is (Select] for Fullerton College students than Cypress College students.
It currently takes users a mean of 26 minutes to install the most popular computer program made by RodeTech, a software design company. After changes have been made to the program, the company executives want to know if the new mean is now different from 26 minutes so that they can change their advertising accordingly. A simple random sample of 51 new customers are asked to time how long it takes for them to install the software. The sample mean is 24.9 minutes with a standard deviation of 2.7 minutes. Perform a hypothesis test at the 0.025 level of significance to see if the mean installation time has changed. Step 3 of 3 : Draw a conclusion and interpret the decision.
According to Facebook, the mean number of community pages, groups and events that users are connected to is 80. A random sample of 64 Facebook users showed a mean of 86 connections to community pages, groups, and events. The sample standard deviation is 48. Test at a 5% significance whether the population mean number of connections to community pages, groups and events is greater than 80, stating the null and alternative hypothesis. Show your work.

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