Katie thinks that people living in a rural environment have a healthier lifestyle than other people. She believes the average lifespan in the USA is 77 years. A random sample of 10 obituaries from newspapers from rural towns in Idaho give x¯=79.33x¯=79.33 and s=2.54s=2.54. Does this sample provide evidence that people living in rural Idaho communities live longer than 77 years? (a) State the null and alternative hypotheses: (Type "mu" for the symbol μμ , e.g. mu >>1 for the mean is greater than 1, mu << 1 for the mean is less than 1, mu not = 1 for the mean is not equal to 1)H0H0 : HaHa :  (b) Find the test statistic, t =

Q: According to a study, a cup of coffee contains an average of 118 milligrams (mg) of caffeine, with…

A: Answer: Using the given data, Margin of error (E) = 5 mg Range of the amount per cup is 55 to 189…

Q: A certain counselor wants to compare mean IQ scores for two different social groups. A random sample…

A: Given that    Sample sizes n1=13    , n2=11      Sample means X̄1=103      , X̄2=116      s1 =15…

Q: Testing the hypothesis using a one-tailed test at 0.01 level of significance, do these data support…

A: here  population standard deviation  = 12 n= 36 alpha  =   0.01

Q: The mean IQ for the entire population in any age group is known to be 100 with a standard deviation…

A: Given: μ0=100n=72x¯ = 103.4s=20.2α = 0.05 Part 1: The null and alternate hypothesis are, H0: μ0 =…

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: We have given the following information.  Hypothesized population mean = 4.5 Sample mean =5.1 Sample…

Q: A psychologist wants to estimate the variance of scores obtained by employees on a test. A random…

A: Confidence interval:A confidence interval shows the probability that a parameter will fall between a…

Q: Suppose we are interested in a confidence interval for the population mean scores on an exam. A…

A: We have given that,  Sample mean (x̄) = 67.89, population standard deviation (σ) = 9.90 and sample…

Q: You collect a sample of 61 observations of animal heights, in mm. The sample mean is 65.19 and the…

A:

Q: A powder diet is tested on 49 people and a liquid diet is tested on 36 different people. The…

A:

Q: You may need to use the appropriate appendix table or technology to answer this question. According…

A: Givensample size(n)=38Mean(x)=3.6standard deviation(s)=2significance level(α)=0.05

Q: Suppose the mean time spent in jail by a first time convicted burglar in the past was 2.5 years. A…

A: Given μ=2.5 years n=25 sample mean(x¯)=3 standard deviation(s)=1.5 Level of significance=0.05 This…

Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

A:

Q: An article presents measurements of arsenic concentrations in fish found in Northern Canada. In a…

A: a)   Consider that μ defines the population mean arsenic concentration in whitefish.

Q: Choose the correct hypotheses to test two matched study samples where measures are taker under…

A: Solution: When the researchers are interested in testing the population mean differences μd then…

Q: In a random sample of 250 high school students, it was found that 85.2% (213) of them later…

A: Solution: From the given information, the 95% confidence interval is (–0.065, 0.065) and the 98%…

Q: According to a report, the mean of monthly cell phone bills was $48.28 three years ago. A researcher…

A: The null hypothesis can be defined as a hypothesis of no difference or equality while the…

Q: In a random sample taken from 3 high schools in Albany area the mean GPA of female seniors (N = 526)…

A: Solution: Given information: n1=526 Sample size of sample 1n2= 477  Sample size of sample 2 x1= 2.92…

Q: A company which designs sports shoes has made an improvement to their popular running shoe. They…

A: The null hypothesis is a statement that contains the statement of equality and the alternate…

Q: A sample of 8 adult elephants had an average weight of x = 12300 pounds. The sample standard…

A: Given that, Mean = 12300 Standard deviation = 22 Sample size = 8

Q: A Industrial Psychology test was written. From a sample of 50 students and it was found that the…

A:

Q: A sample of 100 flounder have a sample mean weight of 21.5 grams. Scientists wish to perform a…

A: Solution: Here, it is to be determined that if the mean weight differs from 20 grams. State the…

Q: Suppose a student measuring the boiling temperature of a certain liquid observes the readings of 6…

A: We have to find the confidence interval for the population mean at a 95%level..

Q: A researcher wanted to use a random sample of 20 Spotify Songs to estimate the average Duration (in…

A: The researcher will most likely use the method of point estimation to estimate the population…

Q: A research center claims that at least 23% of adults think their taxes will be audited.  A random…

A: Yes, there is a enough evidence to reject the claim Explanation:Step 1 : Formulate the hypothesis…

Q: FIND 90% CONFIDENCE INTERVAL FOR THE DIFFERENCE IN POPULATION PROPORTIONS Pf -Pm .

A:

Q: An engineer is comparing voltages for two types of batteries (K and Q) using a sample of 35 type K…

A: There are two independent samples which are type K batteries and type Q batteries. We have to test…

Q: If a researcher failed to use a random sample, how would this affect the research conclusion?   If…

A: Any test criteria's basic assumption is to select a sample that is random. A random sample would be…

Q: The mean IQ for the entire population in any age group is known to be 100 with a standard deviation…

A: The random variable IQ follows normal distribution. The population standard deviation is 15. The…

Q: Find a 90% confidence interval for the true proportion of people that eat frog legs, if in a sample…

A: Given, n = 732 p = 0.65 1 - α = 0.90α = 0.1α2 = 0.05   To find, 90% confidence interval for the true…

Q: A researcher is attempting to calculate a 95% confidence interval for the mean average wingspan of…

A: The random variable wingspan follows normal distribution. We have to find the 95% confidence…

Q: average age to be Sample mean of 2.05 years. The population standard deviation is known to be o =…

A: The null hypothesis states that the average age of coyotes is 1.75 years.The alternative hypothesis…

Q: You work at Yellowstone where there are 350 wolves running around in the park. Your boss wants to…

A: # Given : sample size n=100  Sample mean=120 Standard deviations=15 then to find confidence interval…

Q: A survey of 30 adults found that the mean age of a person's vehicle is 3.6 years. Assuming the…

A: We have given that,  Sample mean (x̄) = 3.6, population standard deviation (σ) = 2 and sample size…

Q: Katie thinks that people living in a rural environment have a healthier lifestyle than other people.…

A: Given ,78.9S = 2.83Sample size , n = 13

Q: A coin-operated drink machine was designed to discharge a mean of 9 ounces of coffee per cup.…

A: The question is about formulation of null and alt. hypo. Given : Popl. mean of coffee machine…

Q: researcher takes a random sample of 100 Americans that have never had a pet and a separate random…

A:

Q: A psychologist has developed a new test to measure depression. Using a very large group of "normal"…

A: For the given data Perform  Z test for one mean

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.