The manufacturer of a truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60000 miles. The population standard deviation is 400 miles. A truck company bought 80 tires and found that the mean mileage for its truck is 59500 miles. Is the truck company’s experience different from the claim of the manufacturer at 5% level of significance? Is it one-tailed or two-tailed test? Also,compute p-value and interpret.

Q: There's a claim that the average tuition fee in a private university for a year in the Philippines…

A: Solution To test the hypothesis we will use z distribution.

Q: What is the minimum percentage of data values that will come within 2.5 standard deviations from the…

A: To find the minimum percentage

Q: Unlike most packaged food products, alcohol beverage container labels are not required to show…

A: The summary of statistics is,

Q: A psychology professor of a large class became curious as to whether the students who turned in…

A: Given that  Sample size n =20 Sample mean =78 Population standard deviation =10

Q: you routinely administer a measure of anxiety to clients in your neuropsychological assessment…

A: Given that you routinely administer a measure of anxiety to clients in your neuropsychological…

Q: The amount of coffee dispensed by a vending machine is assumed to be normally distributed. A vendor…

A: Here's mean is 5.8 and standard deviation is 0.8. Sample number is 36 and population mean is 6. We…

Q: The mean number of English courses taken in a two-year time period by male and female college…

A:

Q: Female cougar weights are normally distributed with mean=102 pounds and standard deviation= 13…

A: Answer:-  Given that, μ=102, σ=13

Q: Farm Sizes. The average farm size in the United States is 444 acres. A random sample of 40 farms in…

A: From the provided information, Sample size (n) = 40 Sample mean (x̄) = 430 Population standard…

Q: Blood glucose levels for overweight tweens, adolescents between the age 9-12, have a mean of 100…

A: A hypothesis test can be conducted to test whether the population mean is equal to the claimed value…

Q: What does having a higher standard deviation means?

A:

Q: The weights of weekly plastic waste from a random sample of 50 American households resulted in a…

A: Given,sample size(n)=50sample mean(x¯)=1.91standard deviation(σ)=1.07α=0.05H0:μ=1.8H1:μ>1.8

Q: in 2015 when she was a high school senior, linda scored 680 on the mathmatics part of the SAT the…

A: Obtain the Z-score for the SAT math score of 680 scored by Linda.Consider the scores on SAT math…

Q: For what lengths will a bolt be​ destroyed?

A: here given, mean = 7cm standard deviation = 0.10 cm

Q: Lakeln -year period by Colleg males took an average of four English courses with a standard…

A: Given: The value of test statistics is given as tcal=-3.108. s1 be the sample standard deviation of…

Q: A marketing firm wants to estimate the difference in the mean amount of caffeine in two brands of…

A:

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: Males have taken as group 1. Females have taken as group 2. Given:…

Q: The average production of peanuts in Virginia is 3000 pounds per acre. A new plant food has been…

A: The unit of interest is the singular observation which used to study the data set. Variable of…

Q: MCAT in a recent year,scores on the medical college admissions test had a mean of 25 and a standard…

A: From the provided information, Mean (µ) = 25 Standard deviation (σ) = 6

Q: The hospital record shows that the mean weight of newly born baby is 7 lbs with the standard…

A:

Q: Happy Hair will hire only those hairdressers in the top 20 percent based on the amount of time it…

A: Given: Mean= μ== 67.5 Standard deviation= σ = 12.5

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: From the Part (iii), the null hypothesis is rejected.

Q: Big babies: The National Health Statistics Reports described a study in which a sample of 335 one-…

A: To find: wheather to reject the null hypothesis or fail to reject the null hypothesis.

Q: Is the variable categorical or quantitative? Categorical (Qualitative) Quantitative (Numerical)…

A: We have given that  Sample size n =13 liters Population mean μ =100 liters Sample mean =85.7 liters…

Q: Can you conclude the mean price in 2013 is greater than the mean price in 2012?

A: Sample size is n = 70 Sample mean = 295 And population SD = 148 Test is that whether  the mean price…

Q: The annual per capita consumption of oranges (in pounds) in the United States can be approximated by…

A:

Q: ccording to the National Sleep Foundation, all children should get 10 hours of sleep each right. In…

A: GIVEN DATA, n=56x¯=8.9s=3.2claim: μ<10α=0.01

Q: A random sample of 84 products is selected and sample mean and standart deviation are found to be…

A: We have to find level of confidence.

Q: The quality-control manager at a light bulb factory needs to determine whether the mean life of a…

A:

Q: Hi! I need your help. Thank you so much! Cranberry syrup is packaged using two production lines. A…

A:

Q: A manufacturer claims that the average tensile strength of thread A exceeds the average tensile…

A: There are two samples, and the sample names are  A and B , each having 48 piece. Thereforen1=48.…

Q: Men hoping to have children are encouraged to avoid hot tubs or saunas because heating the scrotum…

A:

Q: A particular manufacturer (the vendee) uses sample data sent by a vendor to investigate whether the…

A:

Q: shoppers at the mall spend the same amount of money on average the day after Thanksgiving compared…

A: Given that    Sample sizes n1=56      , n2=43       Sample means X̄1= 145     , X̄2=123    , ?1 =46…

Q: 20% of drivers don't use turn signals, observed of 140 cars.  What is the standard deviation of…

A: Given that 20% of drivers don't turn signals and there are 140 cars. That is, p=0.20 and n=140

Q: Isabel recently switched her primary doctor to one specializing in caring for elderly patients. On…

A: sample size(n)=13Mean()=123standard deviation(s)=21significance level()=0.05

Q: The distribution of scores has a mean of 92 and standard deviation of 6. Explain why these scores…

A: A normal distribution has 15.86 percentage values more than one standard deviation units above the…

Q: Using 1% level of significance, test if the population average is not 73.

A: A normally distributed standardized English test is known to have a mean score of 73 and a standard…

Q: Two thousand students took an exam. The scores on this exam are Normally distributed with mean =81…

A:

Q: The number of calories consumed per day for a child is normally distributed with a mean of 1544 and…

A: The number of calories consumed per day for a child is normally distributed with a mean of 1544 and…

Q: Do shoppers at the mall spend the same amount of money on average the day after Thanksgiving…

A: The sample size for first sample is 55, with sample mean 141, and sample standard deviation 47, and…

Q: A student scores 25 in a test. the class of 10 students with mean for the test was 21 and the…

A:

Q: How can i compute the standard deviation

A: