The EPA reports that the exhaust emissions for a certain car model has a normal distribution with a mean of 1.45 grams of nitrous oxide per mile and a standard deviation of 0.4. The car manufacturer claims their new process reduces the mean level of exhaust emitted for this car model. A SRS of 28 cars is taken and the mean level of exhaust emitted for this sample is 1.21 grams.    (a) Calculate the p-value    (b)What is the decision at the 0.01 significance level?

Q: The population mean is $ 1.587. (Round to three decimal places as needed.) Tax Rate Frequency…

A: We have given that the table Class Frequency 0.00 - 0.49 5 0.50 - 0.99 12 1.00 - 1.49 7…

Q: Many body measurements of people of the same sex and similar ages such as height and upper arm…

A: a) The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the…

Q: The number of ants in a group is normally distributed with a mean of 67.0 and a standard deviation…

A: Let X be the random variable for the number of ants in a group. Given that, X~N(μ=67.0, σ=83.64)…

Q: The weights of newborn baby boys are normally distributed with a mean of 3.33 kg and a standard…

A: GivenMean(μ)=3.33standard deviation(σ)=0.40

Q: The strength of 25 samples of steel was tested. The sample mean = 41.9 psi.  The sample standard…

A: Given that,population mean(u)=43sample mean, x =41.9standard deviation, s =3.6number (n)=25

Q: support the scientist’s estimate

A: A scientist estimates that the mean nitrogen dioxide level in Westman is greater than 28 parts per…

Q: he ground has been improved to increase the strength of a ground. The average compressive strength…

A: The provided sample means are shown below: Xˉ1=31\bar X_1 = 31 Xˉ2=38\bar X_2 = 38 X Also, the…

Q: The height for an adult American male resident is normally distributed with average 175.3…

A: given data normal distribution μ=175.3σ=7P(x>171)=?

Q: The frequency distribution was obtained using a class width of 0.5 for data on cigarette tax rates.…

A:

Q: The state of California had a mean annual rainfall of 23 inches and a standard deviation of 4…

A: Answer: From the given data, Let X denotes the mean annual rainfall of California Here, X is…

Q: The masses of packets of tea can be used to follow a normal distribution with mean 250 grams and…

A: The provided information is  µ=250 σ=5 P(X>y)=0.788…

Q: The frequency distribution was obtained using a class width of 0.5 for data on cigarette tax rates.…

A: Frequency distribution of cigarettes tax rate. We have to find out population mean and population…

Q: A manufacturing company produces metal pipes with a desired width of 2.5 cm. Due to machine error,…

A: Introduction: Denote X as the width of a randomly selected pipe produced by the manufacturing…

Q: The frequency distribution was obtained using a class width of 0.5 for data on cigarette tax rates.…

A:

Q: Women's heart beats per minute  are normally distributed with a mean of 72bpm and a std. dev. of…

A: We have to find the percent of women who would have heartbeats between 48bpm and 96bpm.

Q: The mean and standard deviation of hemoglobin level of 23 vibrant students and 21 school children…

A: We have to test claim.

Q: The life of a 9-volt battery is normally distributed with a mean of U = 2000 hours and a standard…

A: Percentiles: If the elements in the data set are arranged in ascending order of magnitude, then the…

Q: Steel rods are manufactured with a mean length of 25 centimeters (cm). Because of the variability in…

A: Given, Steel rod length are normally distributed with mean 25 cm and standard deviation 0.07.

Q: Arsenic occurs naturally in some ground water and can be toxic. A mean arsenic level of μ=9μ=9 parts…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A: Let,  μ1 :  the population mean benzene concentration for untreated water and  μ2: the population…

Q: During the busy season, it is important for the shipping manager at ShipMundo to be able to estimate…

A: Given, Mean, μ=156 Standard deviation,σ=15

Q: ed in the table. = 0.0804 and the standard deviation of the differences is xdif = fference in the…

A:

Q: The average score on an test of sustained attention is 30 with a standard deviation of 5. A…

A:

Q: A pharmaceutical manufacturer forms tablets by compressing a granular material that contains the…

A:

Q: The concentration of benzene was measured in units of milligrams per liter for a simple random…

A:

Q: Arsenic occurs naturally in some ground water and can be toxic. A mean arsenic level of μ=9 parts…

A: Given that α=0.005. Hence, the level of significance is 0.005.   The appropriate Null and…

Q: The difference in the Organic Chemistry final exam scores between last semester and three years ago…

A: Given that

Q: e diameters of Douglas firs grown at a Christmas Tree Farm are normally distributed with a mean of 4…

A: GIVEN DATA, normal distributionμ=4σ=1.5we have to find out the given probabilities.

Q: The carapace length of an adult is normally distributed with a mean of 17.55 mm and a standard…

A:

Q: The amount of weight on an ACME tractor trailer is known to have a normal distribution with mean 9.5…

A:

Q: a life time of a certain brand of tires is approximately normally distributed with a mean of 42,500…

A: Given information- Population mean, µ = 42,500 miles Population standard deviation, σ = 3200 miles…

Q: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

A: Assume that adults have IQ scores that are normally distributed with a mean of 100.3 and a standard…

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

A: From the given information we find the probability.

Q: Unfortunately, arsenic occurs naturally in some ground water. A mean arsenic level of u = 8 parts…

A: One sample z-test: One sample z-test is used to test the significance difference between population…

Q: The amount of sugar was measured for a sample of 30 different breakfast cereals.  The sample mean…

A: Given  X=1.6, n=30, mean=10.4 Standard deviation=s=5.3 We want to find Z score

Q: What would someone's approximate  stanine score be if their raw score was 79 from a group with a raw…

A: Given that Mean = 85 SD = 5 And raw score X = 79

Q: The lengths of a large stock of titanium rods follow a normal distribution with a mean (u) of 440 mm…

A: Given that, The lengths of a large stock of titanium rods follow a normal distribution with a mean…

Q: A process is in statistical control with a mean of 79.5 mm and a standard deviation of 1.85. The…

A: The mean of the data is 79.5 mm. The standard deviation of the data is 1.85 mm. The upper…

Q: The mean yield of corn in the United States is about 120 bushels per acre. A survey of 40 farmers…

A: Let μ be the population mean. The test is to check whether there is enough evidence from the sample…

Q: A water company wants to analyze the the level of a particular contaminant in a water supply. The…

A:

Q: A taxicab company in New York City analyzed the daily number of miles driven by each of its drivers.…

A: It is given that the number of miles driven is normally distributed with mean 200 miles and standard…

Q: An investigation of the relationship between traffic flow (measured in cars per day) and lead…

A:

Q: Avalanches can be a real problem for travelers in the western United States and Canada. Slab…

A: We have to identify correct pair of hypothesis.

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.