A research scientist wishes to test the claim that the mean number of children per classroom in California elementary school is less than 35. She selects a simple random sample of 42 California elementary school classrooms. Are the requirements to test the claim met? Explain in 1 - 2 complete sentences.

Q: What is the  p-value for a sample of 220 undergraduate students with a sample mean credit card…

A: b)

Q: In order to get patients opinion about the services provided to them by a hospital, a sample of 500…

A: A systematic type of sampling is the sampling in which every kth member is selected to gather a…

Q: central airlines claims that the median price of a round-trip ticket from chicago, illinois, to…

A: Sample size(n)=25 Median price=606 The number of tickets below $606 =11

Q: 3. A recent report stated "Based on a sample of 130 truck drivers, there is evidence to indicate…

A: In inferential statistics, the researcher takes data from samples and make generalizations about a…

Q: 32. According to the National Automobile Dealers Association, the mean price for used cars is…

A: x¯=∑i=1n xin=48750050=9750 Sample sd=s=∑i=1n xi-x¯2n=9603985050=1385.9282

Q: The median of a sample is the most frequently occurring value in the sample. A) True False

A: The median is the value that separates the higher half of the data from the lower half of the data.

Q: For a Friedman test, how do wea. measure variation among sample mean ranks for the treatments?b.…

A: (a)SSTR:The variation among the sample means for the treatments, computed for the ranks.

Q: The test statistic is 7.368. Can you draw a conclusion and interpret the decioion?

A: Solution:  Given information: k= 4 categories  α= 0.10 Level of significance

Q: What raw score guesses define the middle 95% of the scores?

A:

Q: Let the sample mean of a set of 20 data points be 30. If it is discovered that a data point having…

A: Given: n=20incorrect x¯=30incorrect value=15correct value=25

Q: According the the U.S. Census bureau, the percentage of Santa Ana residents with a bachelor's degree…

A: From the provided information,

Q: A data set is described as consisting of n = 15 scores. Based on the notation being used, the data…

A: We have the following statement .

Q: A music expert from a CD player company believes that 40% of music lovers prefer romantic music.…

A:

Q: A research scientist wishes to test the claim that the mean number of children per classroom in…

A: Suppose xi, (i=1,2,...,n) be the random sample of size n taken from the normal population with mean…

Q: What is the one-sample t-interval for the mean?  Explain in words and symbols.

A: We use t distribution to estimate interval for population mean when the standard deviation of…

Q: A fire insurance company thought that the mean distance from a home to the nearest fire department…

A:

Q: a. If a constant c is added to each xi in a sample, yielding yi = xi + c, how do the sample mean and…

A: Mean: For a set of n observations, x1, x2, ... , xn mean is defined as, Median: For a frequency…

Q: Why doesn't it make sense to test the hypothesis that the sample mean is 42?

A: It is given that the hypothesis test is sample mean is 42.

Q: 8. Rachel Ray has a popular FoodNetwork show, 30 Minutes Meals. However, in a study conducted by USA…

A: given that

Q: A teacher claims that his students have an average social media usage that is different from 1.83…

A:

Q: Suppose you want to test the claim that a population mean equals 38.  State the null hypothesis.

A: Given that, Claim: population mean equals 38.

Q: Find the interval containing the middle-most 34% of sample means:

A: Let X denote the distribution of values and x¯ be the sample means of the samples of size n=15.…

Q: . Suppose a researcher has heard that children watch an average of ten hours of TV per day. The…

A:

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: The proportion of African that died is p1=x1n1=24534002=0.007205459 The proportion of Europeans that…

Q: an airline promotion to business travelers is based on the assumption that two-thirds ofbusiness…

A: From the information, the given values are, a) Claim: Two-thirds of business travelers use a laptop…

Q: What is the mean to the raw score of 8, 10, 17, 22, 6, 20, 21, 22, 19, 30?

A: Given data is ,8 ,10 , 17 , 22 , 6 , 20 , 21 , 22 , 19 , 30sample size(n)=10

Q: The mean salary of twelve men is $57,000, and the mean salary of four women is $87,000. Find the…

A: The provided information are: Mean salary of 12 men = $57000 Mean salary of 4 women = $87,000 The…

Q: A researcher is using a repeated-measures design to test for mean differences among four treatment…

A: From the provided information, Number of treatments (k) = 4 Each study consist of 18 score in each…

Q: how many subjects are needed to estimate the mean number of books read the previous year with six…

A: It is given that confidence level is 0.90, standard deviation is 11.3 and margin of error E is 6.

Q: Let the sample mean of a set of 20 data points be 30. If it is discovered that a data point having…

A: Given that the sample size is 20 and the sample mean is 30. That is, n=20 and x¯=30 The sample mean…

Q: 4) Students in two fifth grades were given the same English test. One class of 27 students had a…

A: We have, One class of 27 student had a mean of 69 and the second class of 23 student had a mean 74.…

Q: 10 Students in Statistical Analysis of 27 students receives assessment grades of 90, 87, 99, 79,…

A: Given data is 90,87,99,79,89,87,90,90,91,92sample size(n)=10let "x" denoted given data…

Q: According the the U.S. Census bureau, the percentage of Santa Ana residents with a bachelor's degree…

A:

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: Solution : Given : n1 = 32693  n2 = 1536 x1 = 225 x2 = 8 α  = 0.05 To test the evidence that…

Q: Compute the mean, median, and mode time. 68.3, 72.9, 90.7, 111.6, 128.4, 98.1, 94.7, 122.2

A: mean- the mean (average) of a data set is determined by adding all numbers in the data set and then…

Q: Explain the four steps involved in significance testing?

A: Hypothesis testing can be conducted in two ways: Critical value approach. P-value approach. The…

Q: 4. Suppose that only 10 students in Nabatieh campus had taken the midterm. Which of the following…

A: We know that, here  n= 10 (even) So median=(n/2 +(n/2+1)th term)/2 = (5th +6th term)/2

Q: What is the mean amount of money a random 100 students spend if the mean amount they spend on books…

A: By using the normal standard distribution we can find the z score for 99.5% as, P(Z > z ) = 99.5%…

Q: A fire insurance company thought that the mean distance from a home to the nearest fire department…

A: Given that  Mean distance = 4.5 miles  Number of samples = 52  resulting sample mean = 3.7

Q: A historian examining British colonial records for the Gold Coast in Africa suspects that the death…

A: The number of samples extracted from the population is the sample size. When the sample size 30 or…

Q: In a statistics class, 10 scores were randomly selected, and the following results were obtained:…

A: Solution:1) Arranging Observations in the ascending order, We get :65,66,67,68,71,73,74,77,77,77Here…

Q: For fast-food restaurants, the drive-through window is an important revenue source. The fast-food…

A: Given that For fast-food restaurants, the drive-through window is an important revenue source. The…

Q: In order to estimate the mean working hours for a population of 42,800 employees, the HR Manager of…

A: Solution: From the given information, N=42,800 and n=1500.

Q: In a statistics class, 10 scores were randomly selected, and the following results were obtained:…

A: From the provided information, The data values are 74, 73, 77, 77, 71, 68, 65, 77, 67, 66 Sample…

Q: What is the probability that the mean balance for the selected sample is above $295? What is the…

A: n = 200 mean = 300 s = 56

Q: Determine whether the statement describes a descriptive or inferential statistic. 59 % of all…

A: Explanation: It is given that 59% of all students at the local university eat out more than twice a…

Q: The symbol ¯xx¯ represents the mean of the sample. True False

A: The given statement is TRUE. Because, the symbol x-bar represents the mean of a sample.