4. A cardiologist is interested in how much time, in hours, people spend sitting per day. Twohundred adults are randomly selected to wear a device that measures the time spent sitting,standing, or lying down for a period of twenty-four hours. The results have a mean of 11.4hours with a standard deviation of 2.3 hours. Complete the necessary inference procedure toreport the cardiologist's results.A. confidence intervalB.or hypothesis test

Let, x denotes the number of hours spend. It is given that: x=11.4σx=2.3 sample size, n=200

Answered: 4. A cardiologist is interested in how…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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In a survey, students were asked to estimate when one minute was up. The times were 69, 81, 39, 72, and 53 seconds. Does it appear that the student's estimate of one minute is accurate? a. Compute the sample mean and standard deviation. You must show the computations and not use technology. You will have to do this on the exam next Monday. b. Perform a test of hypothesis at a 99% confidence level. Use the p-value method and a two tailed test. c. Perform a test of hypothesis at a 80% confidence level. Use the critical value method and a two tailed test.
Salaries of 46 college graduates who took a statistics course in college have a mean, x, of $61,400. Assuming a standard deviation, σ, of $19,045 , construct a 90% confidence interval for estimating the population mean.
According to a study, brain weights of men in country A are normally distributed with mean 1.36 kg and standard deviation 0.12 kg. Apply the empirical rule to complete each sentence. Complete parts (a) through (d). a. Complete the sentence "Approximately 68% of the men have brain weights between kg and kg." Approximately 68% of the men have brain weights between (Type integers or decimals. Do not round) b. Complete the sentence "Approximately 95% of the men have brain weights between kg and kg. kg and kg. Approximately 95% of the men have brain weights between (Type integers or decimals. Do not round) kg and kg. c. Complete the sentence "Approximately 99.7% of the men have brain weights between kg and kg." Approximately 99.7% of the men have brain weights between (Type integers or decimals. Do not round) kg and kg.
13 5%, 1 of 57 pts A college entrance exam company determined that a score of 21 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 150 students who completed this core set of courses results in a mean math score of 21.4 on the college entrance exam with a standard deviation of 3.2. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 21 on the math portion of the exam? Complete parts a) through d) below. Question Help ▼ Click the icon to view the table of critical t-values. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho: versus H,: Enter your answer in the edit fields and then click Check Answer. parts 4…
1. A random sample of 50 students in Holy Angel University shows that they spend an average of 3 hours per day on social media apps with a standard deviation of 0.5 hours. Assume a normal distribution. Construct a 90% and 97% confidence interval for the average number of hours spent on social media apps per day.
i need C and D
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Which is cheaper: eating out or dining in? The mean cost of a steak, salad, and rice bought at the grocery store is $13.04. A sample of 30 neighborhood restaurants showed a mean price of $12.15 and a standard deviation of $2 for a comparable restaurant meal. 1.1) Develop appropriate hypotheses for a test to determine whether the sample data support the conclusion that the mean cost of a restaurant meal is less than $13.04. 1.2) At alpha = 0.05, what is your conclusion? Show a detailed solution to support your conclusion. (Find p-values at: https://www.socscistatistics.com/pvalues/tdistribution.aspx)
A study of a local city is being conducted to find out the average number of people that use public transportation every day. The sample mean should be within 11 people of the mean people using public transportation. The standard deviation is 100. What is the sample size necessary for a 90% confidence level? O 15 O 223 O 224 O 14.95
Using the Hypothesis Testing Procedures, please complete: The mean age of senators in the 109th Congress was 60.35 years old. A random sample of 40 senators from various state senates had an average age of 55.4 years, and the population standard deviation is 6.5 years. At a = 0.05, is there sufficient evidence that state senators are on average younger than the Senators in Washington
In a random sample of 38 criminals convicted of a certain crime, it was determined that the mean length of sentencing was 61 months, with a standard deviation of 8 months. Construct and interpret a 95% confidence interval for the mean length of sentencing for this crime. Select the correct choice below and fill in the answer boxes to complete your choice.(Use ascending order. Round to one decimal place as needed.) A. 95% of the sentences for the crime are between ____ and ____ months. B. There is a 95% probability that the mean length of sentencing for the crime is between ____ and ____ months. C. We can be 95% confident that the mean length of sentencing for the crime is between

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