A community center claims that the chlorine level in its pool has a standard deviation of 0.48 parts per million (ppm). Samples were taken 27 times over the past month that yielded a standard deviation of 0.61 ppm. Test the center’s claim with a 5% level of significance. What is the test-statistic? Give one reason for your decision to reject/not reject H0 based on: Test statistic compared to critical value(s). State the conclusion, relating it back to the original claim.

Q: The mean jumping height of a sample of 79 university athletes is 89.6 cm with standard deviation of…

A: The objective of this question is to calculate the t-value, which is a measure of the difference…

Q: Companies who design furniture for elementary school classrooms produce a variety of sizes for kids…

A: Given that, Mean = 39.2 Standard deviation = 1.9 Let X follows Normal distribution with mean 39.2…

Q: On a recent quiz, the class mean was 69 with a standard deviation of 2.6. Calculate the z-score (to…

A: Mean = 69Standard deviation = 2.6Raw score = 67

Q: The mean body mass index (BMI) for boys age 12 is 23.6 kg/m2. An investigator wants to test if the…

A: Given  detect a difference in BMI of 2 kg/m2 standard deviation in BMI is 5.7 kg/m2.   Asume that…

Q: Almost all medical schools in the United States require applicants to take the Medical College…

A:

Q: Consider a value to be significantly low if its z score less than or equal to minus−2 or consider…

A: In the question the values are printed two times as 19.419.4. For convenience, the values are taken…

Q: On a recent quiz, the class mean was 78 with a standard deviation of 4.2. Calculate the Z-score (to…

A: The z score indicates how many standard deviations that a data points away from the mean. It can be…

Q: Based on a recent​ study, the pH level of the arterial cord​ (one vessel in the umbilical​ cord) is…

A: Given, Mean = μ =7.23SD = σ = 0.13

Q: A nationwide survey showed that the average selling price for bookbags is $35 with a standard…

A: The mean is 35 and the standard deviation is 5.

Q: The extract of a plant native to Taiwan has been tested as a possible treatment for Leukemia. One of…

A: Given that the collagen amount was found to be normally distributed with a mean is 73 and the…

Q: On a recent quiz, the class mean was 75 with a standard deviation of 4.6. Calculate the z-score (to…

A: Plug in all the values in the above formula

Q: There is concern that increased industrialization may be increasing the mineral content of river…

A: Null hypothesis: µ ≤ 5. Alternative hypothesis: µ >5. Here, the sample mean, x-bar is 5.6.…

Q: The contents of 40 cans of Coke have a mean of 12.15 fl oz and a standard deviation of 0.09 fl oz.…

A: Given, mean, x= 12.15 fl oz  standard deviation, σ = 0.09 fl oz population mean, μ = 12 fl oz X ~…

Q: In a survey sample of 1000 respondents, the mean annual salary is $32,245, with a standard deviation…

A: Solution: Given information: n= 1000 Sample size  x= $32245  Sample mean  s=$4021.54  Sample…

Q: The mean is 28.25 and the standard deviation is 5.72.​ Use the range rule of thumb to find the…

A: The mean is 28.25 and the standard deviation is 5.72.

Q: Based on a recent​ study, the pH level of the arterial cord​ (one vessel in the umbilical​ cord) is…

A: For a  random variable X of a standard normal distribution is known as the standard score or a…

Q: A popular fashion magazine claims that the age of their subscribers is normally distributed with a…

A:

Q: On a recent quiz, the class mean was 73 with a standard deviation of 4.5. Calculate the z-score (to…

A: On a recent quiz, The class mean was 73 with a standard deviation of 4.5.

Q: On a recent quiz, the class mean was 76 with a standard deviation of 2.6. Calculate the z-score (to…

A:

Q: Almost all medical schools in the United States require applicants to take the Medical College…

A: It is given that the scores of all applicants on the biological sciences part of the MCAT were…

Q: College GPAs can range from 0.00 to 4.00. Ben collects GPAs from a sample of students and calculates…

A: Given information, College GPAs can range from 0.00 to 4.00. Ben collects GPAs from a sample of…

Q: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a bell-…

A: Empirical rule :  According to empirical rule ,  68% of data falls within the first standard…

Q: On a recent quiz, the class mean was 71 with a standard deviation of 3.2. Calculate the z-score (to…

A: Given,mean(μ)=71standard deviation(σ)=3.2a person received score (X)=72

Q: On a recent quiz, the class mean was 76 with a standard deviation of 4.2. Calculate the z-score (to…

A: The z-score for a person who received score of 81= (81 - 76) /4.2=1.1904 Here z-score is 1.1904…

Q: In a particular examination, the mean score is 82 and the standard deviation is 3.7. Wha is the Z-…

A: Given that the mean is 82 and standard deviation is 3.7. That is, μ=82σ=3.7

Q: On a recent quiz, the class mean was 71 with a standard deviation of 3.8. Calculate the z-score (to…

A: Given Data: Let us consider the given data: Mean μ=71Standard deviation σ=3.8Raw scorex=59 To Find:…

Q: The population mean of happiness is 5.382, with a standard deviation of 1.138. Linda has a z score…

A: We have given that,  Let X be a random variable following normal distribution with mean (Mu) = 5.382…

Q: The sodium content of a popular sports drink is listed as 220 mg in a 32-oz bottle. Analysis of 10…

A:

Q: Consider a value to be significantly low if its z score less than or equal to - 2 or consider a…

A: We have to find significantly low numbers.

Q: The thickness of a certain grade of hardboard stocked by a DIY shop is normally distributed with a…

A: Given that  Let Xi be the thickness of a certain grade of hardboard stocked by a DIY shop is…

Q: When he was 3 months old, Benjamin Chance weighed 13.8 pounds. The national average for the weight…

A:

Q: Height and age: Are older men shorter than younger men? According to a national report, the mean…

A:

Q: An injection moulding machine produces battery connectors for mobile phones. The process "usually"…

A: The random variable X follows normal distribution. The sample mean is 3.8 mm. The population…

Q: We know that the Montana ACT scores are normally distributed with a mean of 20.1 and a standard…

A: It is given that the Montana ACT scores are normally distributed with a mean of 20.1 and a standard…

Q: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a…

A: Given information population mean μ=60, standard deviations σ=5  P(45< X< 70)=?

Q: Adult heights are known to follow a normal distribution.  In this activity, you will determine how…

A: My height is 5.4 foot or 64.8 inches and I am a woman. For, Z-score, Z=64.8-μσ=64.8-652.5=-0.08

Q: Pumpkins from a local farmer have a mean weight of 16 pounds with a standard deviation of 2.5…

A: Given information: It is given that, Pumpkins from a local farmer have a mean weight of µ = 16…

Q: The number of potholes in any given 1 mile stretch of freeway pavement in Pennsylvania has a…

A: Mean = 48 Standard deviation = 11

Q: The length of time it takes for a manufacturer to build a car is normally distributed with a mean of…

A:

Q: On a recent quiz, the class mean was 76 with a standard deviation of 2.5. Calculate the z-score (to…

A: From the given information,Mean was 76 and standard deviation of 2.5.Formula for z-score is,

Q: On a recent quiz, the class mean was 70 with a standard deviation of 3.9. Calculate the z-score (to…

A:

Q: A special education teacher did research on whether or not there is a relationship between the…

A: The correlation coefficient and slope are –0.863 and –1.212294, respectively.

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.