Electric bulb manufactured by X and Y companies gave the following results : Using standard error of the difference between mean, state whether there is any significant difference X- Company Y- Company No. of bulbs used 100 100 Mean Life in hours 1300 1248 Standard Deviation in hours 82 93 in mean life of the two makes.

Q: In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes.…

A: given  n= 50 ∑x=205∑(x-x)2=56.43

Q: The weight of an organ in adult males has a bell-shaped distribution with a mean of 310 grams and a…

A: Given Information: Mean μ=310 grams Standard deviation σ=35 grams (a) About 99.7% of organs will be…

Q: The amount of time that office workers at Company XYZ spend on the computer each workday is normally…

A: 1] Mean μ=3.1 2] Standard deviation σ=0.5

Q: How many Kleenex should the Kimberly Clark Corporation package of tissues contain? Researchers…

A: Given that: Let x is number of tissues used during a cold Sample size n=100 and population mean μ=60…

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A: Positive z score shows the number of z Sd above the mean or heavier than the mean by z standard…

Q: The heights of women aged 2020 – 2929 in the United States are approximately Normal with mean…

A: Obtain the z‑score for a woman 5.5 feet tall. The z‑score for a woman 5.5 feet tall is obtained…

Q: Orange juice is bottled on two different production lines. A sample of 5 bottles from the first line…

A: Given problem Given that Orange juice is bottled on two different production lines. A sample of 5…

Q: Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought…

A: Here the sample is more than 30. Therefore z test can be used here.Null hypothesis:The mean cost of…

Q: Response time is an important statistic for measuring the effectiveness of a fire department, and is…

A: Using stardization of Normal distribution

Q: A principal at a certain school claims that the students in his school are above average…

A: Given : Sample size (n)=30Sample meanx¯=112.5Population mean μ=100population standard…

Q: 200 people were randomly sampled and asked what they regularly eat for breakfast or lunch. Each…

A: Any assumption about the parameter or probability function is known as hypothesis testing. For the…

Q: The mean and standard deviation of the tax value of all vehicles registered in NCR are μ=550,000 and…

A: We want to find sample mean and  standard deviation of the sample mean

Q: A sample of 90 items has mean 55 and standard deviation 3. A second sample of 110 items has mean 60…

A:

Q: THME REMAIIN: 02:53:15 Response time is an important statistic for measuring the effectiveness of a…

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Q: A medical investigation claims that the average number of infections per week at Al-Ahli hospital is…

A: We have to find correct answer...

Q: 1.900 22 1.900 20 7. True or False? Assume a researcher recruits 150 African American and Caucasian…

A: We have given that the data information of 150 African Americans and Caucasians individuals.

Q: The weight of an organ in adult males has a bell-shaped distribution with a mean of 310 grams and a…

A:

Q: 50 high school students were asked how many hours they study per day. The mean was 1.5 hours, with a…

A: For claim H0:μ=1.2 hrs: The test statistic is, t=x¯-μsn=1.5-1.20.550=0.30.070710678=4.2426 The test…

Q: Airline companies are interested in the consistency of the number of babies on each flight, so that…

A: Test for Variance: The χ2 Chi-Square test is used to test the significance difference between…

Q: community college Math instructor feels that the average number of units students enroll in each…

A: Hypothesis testing  Hypothesis testing is conducted for the parameters of the population like…

Q: 17. A machine fills bottles with cola. The mean fill is 341 mL with a standard deviation of 2 mL.…

A: Answer:17- Given mean μ = 341 ml   and a standard deviation σ = 2 ml                    The…

Q: Assume the average amount of days a patient spends in hospital is believed to be 14 days and a…

A: Given Mean=Xbar=12.5 Standard deviation=sigma=4.8 n=sample size=33 mu=14 Alpha=0.05

Q: A hospital president claims that the average salary of registered nurses at her hospital is more…

A: Note: Hi there! Thank you for posting the question. As there are several independent questions,…

Q: The mean age at first marriage in the U.S. is 28. A random sample of 626 married residents of New…

A:

Q: Which of the following would be expected to result in a larger standard error of the mean? A. a…

A: standard error is calculated as, standard error SE=standard deviation σnn =sample size Explanation:…

Q: The supervisor of MCL Group of Companies claims that the mean weight of their laundry product is 350…

A: Given, μ=350 n=45 x-=345 s=10.5

Q: A random sample of 75 medical doctors in Detroit showed that they worked an average of 55.1…

A: Conditions for Two sample Independent t test: The two samples are independent to each…

Q: In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes.…

A: Sample  - a sample is a set of measurements taken from a larger population.  Sample mean - The…

Q: Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought…

A: a)   Denote μ as the population mean cost of restaurant meal.

Q: use a one sample z-test to determine whether or not a sample mean of 34 differs from the population…

A:

Q: 5. In an Oreo factory, the mean mass of a cookie is given as 40 g. For quality control, the standard…

A: Assume, X be the random variable which follows normal distribution with Mean=μ and Standard…

Q: 50 high school students were asked how many hours they study per day. The mean was 1.5 hours, with a…

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Q: A clinical researcher performs a clinical trial on 12 patients to determine whether a drug treatment…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: The sample uric acid levels of selected basketball and tennis players of the same age and gender in…

A: Given data is appropriate for testing of hypothesis to test t-test for difference of means. because…

Q: he cheetah is the fastest land mammal and Is highly specialized to run down prey. The cheetah often…

A: Given data, μ=59.53σ=4.19

Q: 200 people were randomly sampled and asked what they regularly eat for breakfast or lunch. Each…

A: INTRODUCTION: The distribution of the difference between the two sample means follows a normal…

Q: A large oil company is studying the number of gallons of gasoline purchased per customer at…

A: GivenMean = 11.2standard deviation(σ)=3.0Median = 12.25

Q: Ten oil tins are taken at random from an automatic filing machine. The mean weight of the 10 tins is…

A: Given  μ=population mean=16, s=standarddeviation=0.50, n=10,  x̄=mean=15.8  tcritical=2.26

Q: A

A:

Q: 200 people were randomly sampled and asked what they regularly eat for breakfast or lunch. Each…

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Q: Using a mean of 10 and standard deviation of 2.45, convert these z-scores back into raw scores.…

A: Given: Formula:

Q: Airline companies are interested in the consistency of the number of babies on each flight, so that…

A: Given n=23 sample standard deviation, s = 9 population standard deviation, σ = 6 and  α = 0.05

Q: A factory produces sacks of flour, a sample of 14 pieces with the following weights are taken: Find…

A:

Q: To confirm the effectiveness of some medicine, its concentration in blood must exceed 400 ppm (parts…

A: To confirm the effectiveness of some medicine, its concentration in blood must exceed 400 ppm (parts…

Q: 2. Alfred scored 82 in a quiz in English for which the average score of the class was 75 with a…

A: GivenAlfred scored 82 in a quiz in english with Mean(μ)=75standard deviation(σ)=10score 70 in a quiz…

Q: The weights of packs of chewing gum for a certain brand have a mean of 47.1 grams and a standard…

A:

Q: After a sewer spill into a lake, an environmentalist wanted to test to see if the water was saf an…

A: