A lumber company is making boards that are 29432943 millimeters tall. If the boards are too long they must be trimmed, and if they are too short they cannot be used. A sample of 1414 boards is made, and it is found that they have a mean of 2940.52940.5 millimeters with a variance of 144144. Is there evidence at the 0.0250.025 level that the boards are too short and unusable? State the null and alternative hypotheses for the above scenario

Q: A researcher randomly sampled 53 hens of a certain species andcounted the number of eggs laid during…

A:

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A: Given information- For fertilizer A- Sample size n1 = 41 Sample mean, x1 = 183 tons Sample standard…

Q: What is the probably of observing a difference in sample means less than 0.5?

A: here given , Assume the same population of nurses from CR hospital with the same mean and standard…

Q: The fan blades on commercial jet engines must be replaced when wear on these parts indicates too…

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer three sub-parts at a…

Q: mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters. an investigator…

A: Given that  The mean lung capacity for nonsmoking males in the population aged 50 is 2.2 liters =…

Q: winter months in Virginia have a mean of 62o F. A meteorologist in southwest Virginia believes the…

A: We have given that  Sample size n= 30 Sample mean = 59 Standard deviation = 6.21 P-value = 0.007

Q: The total sleep time per night among college students was apprximately normally distrubuted with…

A: Central limit theorem: The central limit theorem states that the sampling distribution of the sample…

Q: A lumber company is making boards that are 2902.02902.0 millimeters tall. If the boards are too long…

A: From the provided information, Sample size (n) = 12 Sample mean (x̄) = 2899.4 Sample standard…

Q: In a random sample of 23 private school teachers in queens county the average teaching experience is…

A:

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A: We have to fínd conclusion.

Q: A researcher was interested in comparing the resting pulse rate of people who exercise regularly and…

A: T-test for difference of mean:                                    test statistic is:…

Q: When people smoke, the nicotine they absorb is converted to cotinine, which can be measured. A…

A: Given,   Sample size = 40 Sample mean = 172.5 Population standard deviation = 119.5   Under the…

Q: A study was conducted to estimate the variance of the annual temperatures of a city. To find this,…

A: Solution: n= 12 Sample size  s2=65.4 Sample variance α=0.05 Level of significance

Q: a variance of 65.4 F of the annual temperature was computed. Construct a 95% confidence interval for…

A: On the 15th day of each month during the last 12 months, a variance of 65.4 F of the annual…

Q: The burning rates of two different solid-fuel propellants used in air crew escape systems are being…

A: We have to find the significance of mean, confidence interval and find whether p value is greater or…

Q: The fan blades on commercial jet engines must be replaced when wear on these parts indicates too…

A:

Q: 3. Over a long period of time, it was found that the time taken for the standard physical task is…

A: Given,sample size(n)=75sample mean(x¯)=46population standard deviation(σ)=10population…

Q: A tire company finds the lifespan for one brand of its tires is normally distributed with a mean of…

A: Solution: Let X be the lifespan for one brand of its tires is normally distributed with a mean of…

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A: Formula : Test statistic

Q: eople are randomly selected and the accuracy of their wristwatches is checked, with positive errors…

A: Given  Population mean μ=0, sample mean x̄=102, n=sample size=50 , population standard deviations…

Q: rs that are 2058.0 millimeters tall. If the doors are too long they must be trimmed, and if the…

A: Let X be the random variable such that how long the doors are millimeters tall. x¯: Sample mean of…

Q: The fan blades on commercial jet engines must be replaced when wear on these parts indicates too…

A: a) The level of significance, α=0.01. As the null hypothesis, assume that the variance of…

Q: Determine the decision rule for rejecting the null hypothesis H0H0. Round the numerical portion of…

A: Given that  Sample sizes n1=70      , n2=85       Sample means X̄1=8.84     , X̄2=9.05      ?1 =0.30…

Q: A survey of the population of 51 students in Psych 311 asks how many credits students are taking and…

A: Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A: We have to find hypothesis..

Q: A lumber company is making doors that are 2058.0 millimeters tall. If the doors are too long they…

A: Population mean, μ = 2058.0 millimeters Sample mean,  = 2044.0 millimeters Sample size, n = 20…

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A: Given: for fertilizer A n1=41 meanx1=183 standard deviation(S1)=37 for fertilizer B n2=61…

Q: The fan blades on commercial jet engines must be replaced when wear on these parts indicates too…

A: The null and alternative hypotheses are: H0:σ2≤0.18 mm2 H1:σ2>0.18 mm2

Q: In a recent​ study, the distances of certain raptor nests to the nearest marshland were studied. The…

A:

Q: A sports science group claims that due to improved training methods, professional cyclists burn a…

A:

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A: Given data normal diaatributionμ = 26.88 lbσ = 12.74 lbn = 5028over load if x¯ >27.37

Q: An automobile manufacturer has given its car a 34.1 miles/gallon (MPG) rating. An independent…

A: Suppose μ is the population mean MPG rating of the car.

Q: Under the old method of postoperative treatment, the mean length of patients' hospital stay was 7.2…

A: It is given that: The sample size, n=165 The sample average duration (in days) of stay by the new…

Q: A study by researchers addressed the question of whether the mean body temperature of humans is…

A: State the hypotheses.

Q: A manufacturer of chocolate chips would like to know whether its bag filling machine works correctly…

A:

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A:

Q: A survey found that​ women's heights are normally distributed with mean 62.2in. and standard…

A: Men mean =67.7 s = 3.5

Q: In a time study conducted at a manufacturing plant, the time to complete a specified operation was…

A:

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A:

Q: If we were going to perform a hypothesis test for the population mean with Ho : µ> 1200 vs H : u<…

A: Given information: μ=1200, σ=400, n=50α=0.05 H0 : μ≥1200HA : μ&lt;1200 The given hypothesis test is…

Q: An agricultural company is trying to decide which type of fertilizer to use on its crops. The…

A: It is given that the testing results in there is no difference between the average yields using the…