**Assessment of Typing Course Effectiveness**A sample of 8 students was selected to test the effectiveness of a course designed to improve typing skills. Their typing scores before and after the course are recorded below. Suppose that we would like to test whether the course is effective (i.e., the mean after-score is higher than the mean before-score) at α = 0.01. What is the critical value?| | Before | After ||---------|--------|-------|| Student 1 | 45 | 56 || Student 2 | 38 | 42 || Student 3 | 60 | 62 || Student 4 | 35 | 39 || Student 5 | 70 | 75 || Student 6 | 48 | 50 || Student 7 | 39 | 42 || Student 8 | 49 | 56 |**Options for Critical Value:**- -3.355- -2.326- -2.896- -3.499- -2.576- -2.998**Explanation:**To determine the effectiveness of the typing course, we conduct a hypothesis test. The null hypothesis (H₀) assumes there is no improvement (mean after-score is not higher than the mean before-score), while the alternative hypothesis (H₁) assumes there is an improvement. The provided responses represent possible critical values for this test based on the significance level α = 0.01.If the test statistic (calculated from the data) is greater than the critical value, we reject the null hypothesis, indicating that the course is effective.This exercise involves applying statistical methods to analyze and interpret the data, aiding in educational research and decision-making.

The question is about paired t test Given : Sample no. of students ( n ) = 8 Level of signif. ( α )…

Answered: A sample of 8 students were selected to…

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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When you are done, click here to see a summary of your score Question with last attempt is displayed for your review only In a certain school district, it was observed that 29% of the students in the element schools were classified as only children (no siblings). However, in the special program for talented and gifted children, 130 out of 373 students are only children. The school district administrators want to know if the proportion of only children in the special program Is significantly different from the proportion for the school district. Test at the a 0.05 level of significance. What is the hypothesized population proportion for this test? P=0.34 (Report answer as a decimal accurate to 2 decimal places. Do not report using the percent symbol.) Based on the statement of this problem, how many tails would this hypothesis test have? one-tailed test two-tailed test Choose the correct pair of hypotheses for this situation: (A) (C) Ho p 0.29 0.29 (В) Но:P 0.29 Ho: p 0.29 H: p 0.29 (D)…
If a person’s z score equals 1.61, what percentage of the observations are more extreme?
Nabisco claims that Chip Ahoy Cookies have an x ̅=28.67 chocolate chips per cookie with a SD=2.67. You randomly select 36 cookies from a new bag and carefully remove all the chocolate chips from each of the 36 cookies. You find the mean of the chocolate chips for the 36 cookies is 24.27 chocolate chips per cookie. Calculate the standard error for the chocolate chips in your experiment. (round to the nearest hundredth).
What does a z-score of 3 for a data value x represent? What does a x score of -1 for a data value x represent?
The average home in the US is expected to cost $240,000. A random sample of 56 homes sold this month showed average price of $232,000. Assume you have access to this data. We are interested in determining cost if the cost of average home has decreased this month. If the test statistic is -1.66 what is the p-value?
The claim is that the proportion of peas with yellow pods is equal to 0.25 (or 25%). The sample statistics from one experiment include 450 peas with 117 of them having yellow pods. Find the value of the test statistic.
On average, a sample of n = 36 scores will provide a better estimate of the population mean than a sample of n = 49 scores from the same population.
Explain the t-test as it relates to its application to one samples
2. (MMC 6.43). The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude toward school, and study habits of students. Each score ranges from 0 to 200. The mean attitude score for U.S. college students is about 110, and the standard deviation is about 25. A teacher who suspects that older students have better attitudes toward school gives the SSHA to 25 students who are at least 30 years of age. Their mean score is = 118.3. a. Assuming that o = 25 for the population of older students, carry out a test of Họ: H = Ha:u > 110 Report the P-value of your test and state your conclusion clearly. = 110 b. What are the required assumptions in part (a)?
Standardized measures seem to indicate that the average level of anxiety has increased gradually over the past 50 years. (Twenge, 2000). In the 1950s , the average score on the Child Manifest Anxiety Scale was ?= 15.1. A sample of n = 16 of today's children produces a mean score of M = 23.3 with SS = 240. Based on the sample, has there been a significant increase in the average level of anxiety since the 1950s? Use a one-tail test with α= .05. ****Is the critical region 1.753? Positive or Negative?**
Each of a sample of 171 residents selected from a small town is asked how much money he or she spent last week on state lottery tickets. 90 of the residents responded with $0 . The mean expenditure for the remaining residents was $23 . The largest expenditure was $250 --> What is the mode of the data?
Solve it on paper! Please use t tests on this question. Do not use z tests!

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