A machine is designed to manufacture bolts with a diameter of 15 mm. 23 bolts are examined, andit's found they have a mean diameter of 15.1 mm, with a standard deviation of .37 mm. To a 2.5%level of significance, can it be asserted that, in general, the standard deviation of the bolts is over .25mm?[Assume that the bolt diameters are normally distributed.]

From the provided information, Sample size (n) = 23 Sample standard deviation (s) = 0.37 Level of…

Answered: A machine is designed to manufacture…

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 data table contains waiting times of customers at a bank, where customers enter a single waiting line that feeds three teller windows. Test the claim that the standard deviation of waiting times is less than 2.12.1 minutes, which is the standard deviation of waiting times at the same bank when separate waiting lines are used at each teller window. Use a significance level of 0.050.05. Complete parts (a) through (d) below. LOADING... Click on the icon to view the data. 7.9 6.4 7.3 6.7 7.3 6.4 6.9 7.1 8.3 6.2 6.3 7.2 8.8 6.1 8.9 7.5 7.5 7.6 6.1 7.6 7.3 7.7 7.9 10.1 7.1 6.1 6.5 6.6 6.7 6.9 6.6 6.8 6.9 14.6 6.6 7.2 7.7 7.5 7.6 6.3 13.9 7.2 8.7 7.5 6.1 6.3 7.4 6.1 6.7 6.3 9.1 8.3 6.4 7.9 7.5 8.5 7.8 6.3 6.5 6.5 a. Identify the null and alternative hypotheses. Choose the correct answer below. A. Upper H 0 : sigma greater than or equals 2.1H0: σ≥2.1 minutes Upper H Subscript Upper A Baseline : sigma less than 2.1HA: σ<2.1 minutes B. Upper H 0 : sigma…
A survey found that women's heights are normally distributed with mean 63.4 in. and standard deviation 2.5 in. The survey also found that men's heights are hormally distributed with mean 68.3 in. and standard deviation 3.7 in. Most of the live characters employed at an amusement park have height requirements of a minimum of 57 in. and a maximum of 62 in. Complete parts (a) and (b) below. a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at he amusement park? The percentage of men who meet the height requirement is %. Round to two decimal places as needed.)
Based on a recent study, the pH level of the arterial cord (one vessel in the umbilical cord) is normally distributed with mean 7.27and standard deviation of 0.11. Find the percentage of preterm infants who have the following arterial cord pH levels. a. pH levels between 7.00 and 7.50. b. pH levels over 7.35. a. The percentage of arterial cord pH levels that are between 7.00and 7.50 is __________%. (Round to two decimal places as needed.) b. The percentage of arterial cord pH levels that are over 7.35 is _______%. (Round to two decimal places as needed.)
In an effort to estimate the mean amount spent per customer at restaurants in Shreveport, data were collected for a sample of 35 customers. The sample average was $28.99. Assume a population standard deviation of $5.75. At 99% confidence, what is the margin or error? (Leave your answer in two decimal places, and don't include a dollar sign. ex: 1.23)
Assume that Christmas trees sold in a farm have heights that are normally distributed with a mean of 63.6 inches and a standard deviation of 2.5 inches. Find the value of the quartile Q3 (75% of trees are shorter than this height). 65.3 inches 64.3 inches 66.1 inches O 67.8 inches
A triathlon consisting of swimming, cycling, and running is one of the more strenuous amateur sporting events. An article reports on a research study involving nine male triathletes. Maximum heart rate (beats/min) was recorded during performance of each of the three events. For swimming, the sample mean and sample standard deviation were 187.0 and 7.2, respectively. Assuming that the heart-rate distribution is (approximately) normal, construct a 98% CI for true mean heart rate of triathletes while swimming. (Round your answers to one decimal place.) USE SALT beats/min You may need to use the appropriate table in the Appendix of Tables to answer this question.
The diameter of a spindle in a small motor is supposed to be 4.4 millimeters (mm) with a standard deviation of 0.11 mm. If the spindle is either too small or too large, the motor will not work properly. The manufacturer measures the diameter in a sample of 15 spindles to determine whether the mean diameter has moved away from the required measurement. Suppose the sample has an average diameter of 4.27 mm. H0: Ha: (b) Harry thinks that prices in Caldwell are lower than the rest of the country. He reads that the nationwide average price of a certain brand of laundry detergent is $20.95 with standard deviation $0.78. He takes a sample from 5 local Caldwell stores and finds the average price for this same brand of detergent is $18.31. H0: Ha:
According to a recent study, the carapace length for adult males of a certain species of tarantula are normally distributed with a mean of μ=17.47 mm and a standard deviation of σ=1.95 mm. Complete parts (a) through (d) below. a. Find the percentage of the tarantulas that have a carapace length between 15mm and 16 mm. The percentage of the tarantulas that have a carapace length between 15 and 16 is nothing %.
During an economic crisis, the average value of homes in a community of 36 homes lost $9445 with a standard deviation of $1300. The average home value in the region lost $8990. Was this community of 36 homesunusual? Use a t-test to decide if the average loss observed was significantly different from the region value. Use a level of significance α=0.05. Identify the hypotheses for the test. H0: μ ▼ not equals≠ equals= greater than> less than< nothing HA: μ ▼ equals= greater than> not equals≠ less than< nothing The test statistic is nothing. (Round to two decimal places as needed.) The P-value is nothing. (Round to three decimal places as needed.) What is the conclusion of the test? Was the average loss observed significantly different from the region value? ▼ Reject Fail to reject the null hypothesis because the P-value is ▼ greater less than the given significance level, and conclude that the…
Only need help with finding tcalc.

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