A pizza delivery chain advertises that it will deliver your pizza in 35 minutes from when the order is placed. Being a skeptic, you decide to test and see if the mean deliverytime is actually more than 35 minutes. For the simple random sample of 14 customers who record the amount of time it takes for each of their pizzas to be delivered, themean is 37.0 minutes with a standard deviation of 9.9 minutes. Assume that the population distribution is approximately normal. Perform a hypothesis test using a 0.05level of significance.Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below.Ho: 35Họ 1 =H₂H=35

In hypothesis testing, we start by stating the null hypothesis (H0) and the alternative hypothesis…

Answered: A pizza delivery chain advertises that…

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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A marketing firm asked a random sample of people from a population how much they spend annually on oral hygiene products. The marketing firm then asked many other random samples of people from the same population the same question. The mean amount of each sample was computed, and then the mean of all the sample means was found to be $162.35. The standard deviation of all the sample means, or the standard error of the mean, was found to be $23.78. At a 95% confidence level, which values fall within the margin of error for the amount a person from the population spends annually on oral hygiene products? Select all that apply. $128.30 $203.36 $112.73 $206.04 $107.88 $189.85 $210.92 $101.17
A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1484 and the standard deviation was 312. The test scores of four students selected at random are 1890, 1240, 2210, and 1370. Find the z-scores that correspond to each value and determine whether any of the values are unusual.
Suppose that 35% of all adults in a population would say “good” and 65% would say “bad” if they were asked how they view the state of the economy. An opinion poll asks this question of an SRS of 1000 adults from the population. In repeated samples, the sample proportion who say “good” would follow a normal distribution. What is the standar deviation?
You are a consumer advocate. A particular brand of tires state that they last for 50,000 miles before it needs to be replaced. You solicit survey responses from people that own the tire to ask how many miles their tire lasted before they had to replace them. The survey results showed an average life-span of 46,500 miles with a standard deviation of 9,800 miles. Which statistical test would be best to determine if the tires last significantly less than 50,000 miles?
You are a consumer advocate. A particular brand of tires state that they last for 50,000 miles before it needs to be replaced. You solicit survey responses from people that own the tire to ask how many miles their tire lasted before they had to replace them. The survey results showed an average life-span of 46,500 miles with a standard deviation of 9,800 miles. Which statistical test would be best to determine if the tires last significantly less than 50,000 miles? z-test one-sample t-test independent samples t-test ANOVA
In a large section of a statistics class, the points for the final exam are normally distributed, with a mean of 72 and a standard deviation of 7. Grades are assigned such that the top 10% receive A's, the next 20% received B's, the middle 40% receive C's, the next 20% receive D's, and the bottom 10% receive F's. Find the lowest score on the final exam that would qualify a student for an A, a B, a C, and a D. The lowest score that would qualify a student for an A is________ (Round up to the nearest integer as needed.) The lowest score that would qualify a student for a B is_______ (Round up to the nearest integer as needed.) The lowest score that would qualify a student for a C is ______ (Round up to the nearest integer as needed.) The lowest score that would qualifty a student for a D is______ ( Round up to the nearesr integer as needed.)
A parenting magazine reports that the average amount of wireless data used by teenagers each month is 10 Gb. For her science fair project, Ella sets out to prove the magazine wrong. She claims that the mean among teenagers in her area is less than reported. Ella collects information from a simple random sample of 4 teenagers at her high school, and calculates a mean of 8.4 Gb per month with a standard deviation of 2.2 Gb per month. Assume that the population distribution is approximately normal. Test Ella's claim at the 0.05 level of significance. Step 1 of 3: State the null and alternative hypotheses for the test. Fill in the blank below. Η :μ H₂H = 10 10
The results of a common standardized test used in psychology research is designed so that the population mean is 115 and the standard deviation is 30. A subject earns a score of 199. What is the z-score for this raw score?
A parenting magazine reports that the average amount of wireless data used by teenagers each month is 10 Gb. For her science fair project, Ella sets out to prove the magazine wrong. She claims that the mean among teenagers in her area is less than reported. Ella collects information from a simple random sample of 4 teenagers at her high school, and calculates a mean of 8.4 Gb per month with a standard deviation of 2.2 Gb per month. Assume that the population distribution is approximately normal. Test Ella's claim at the 0.05 level of significance. Step 3 of 3: Draw a conclusion and interpret the decision. Answer Tables Keypad Keyboard Shortcuts We reject the null hypothesis and conclude that there is sufficient evidence at a 0.05 level of significance that the average amount of wireless data used by teenagers each month is less than 10 Gb. We reject the null hypothesis and conclude that there is insufficient evidence at a 0.05 level of significance that the average amount of wireless…
The length of songs in the Big Hair playlist of a Statistics professor's mp3 player varies from song to song. This variation can be modeled by the normal distribution, with a mean song length of �=4.3 minutes and a standard deviation of �=0.65 minutes. (Note that a song that has a length of 4.5 minutes is a song that lasts for 4 minutes and 30 seconds.)The professor decides to shuffle the playlist, which means that the mp3 player will randomly pick a song within this particular playlist and play it next.(a) What is the probability that the next song to be played is between 3.9 and 4.85 minutes long? Answer to four decimals. (b) What proportion of all the songs in this playlist are longer than 5 minutes? Use four decimals in your answer. (c) 20% of all the songs in this playlist are at most how long, in minutes? Enter your answer to two decimals. minutes(d) There are 247 songs in the Big Hair playlist. How many of these would you expect to be longer than 5 minutes in length? Use two…
You may need to use the appropriate technology to answer this question. Data were collected on the top 1,000 financial advisers. Company A had 239 people on the list and another company, Company B, had 121 people on the list. A sample of 16 of the advisers from Company A and 10 of the advisers from Company B showed that the advisers managed many very large accounts with a large variance in the total amount of funds managed. The standard deviation of the amount managed by advisers from Company A was s₁ = $583 million. The standard deviation of the amount managed by advisers from Company B was s₂ = $484 million. Conduct a hypothesis test at a = 0.10 to determine if there is a significant difference in the population variances for the amounts managed by the two companies. What is your conclusion about the variability in the amount of funds managed by advisers from the two firms? State the null and alternative hypotheses. 2 2 H₂:0 2 Find the value of the test statistic. (Round your answer…
in a test of a lifelong brand of tires , a survey revealed that the mean life was 35,000 mikes and the standard deviation was 7083 mikes. if the shape of the population distribution is known to be normal, approximately what percentage of the tires lasts less than 20834 miles ?

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