Do ESL students score lower in English college placement tests than the national average? A researcher obtained the English placement test scores of a random sample of 53 ESL students. He finds that the mean score of these 53 students is 147.9. Is this significantly different from the national average (μ = 150, σ = 15)? Which test is appropriate for this study? Group of answer choices two-tailed z-test one-tailed z-test one-tailed t-test two-tailed t-test

Q: (b) The variance of scores in a mathematics test for high school learners was 150 in 2005. A sample…

A: Given, Population Variance = 150 n= 20 Sample variance =170

Q: If the t-test statistic for a single t-test is 1.58, what can you conclude? A) The test is…

A: It is given that the t-test statistic is 1.58. a. Here, the degrees of freedom or sample size are…

Q: Which of the following is not needed to compute a t-statistic, and do a one-sample t-test? (Hint:…

A: Formula for t statistic :

Q: Y Each individual in a sample was asked to indicate on a quantitative scale how willing he or she…

A: The negative sign here signifies that there is a indirect relationship between the variables.…

Q: A study is made of residents in Phoenix and its suburbs concerning the proportion of residents who…

A: We are conducting the z test for two proportion test in this given scenario and the complete…

Q: In a study of cereal leaf beetle damage on oats, researchers measured the number of beetle  larvae…

A:

Q: Using Excel, conduct a t-test (at the alpha = 0.10 significance level) on whether the mean of X2 is…

A: The question is based on hypo. testing of a popl. mean. As popl. std deviation is unknown we need to…

Q: a) Find t. (Give your answer correct to two decimal places.)

A: n = 44, Σd = 224, Σd2 = 6268   The mean is given by   The standard deviation is given by

Q: A sociologist finds that for a certain population, the mean number of years of education is 13.20,…

A: (a) State the hypotheses. That is, the mean for this region is the same as the mean of the…

Q: A researcher has a first-grade readiness test that is administered to kindergarten students and…

A: Given: Population mean  μ=60. Population standard deviation σ=10.  Sample size n=58. Sample mean…

Q: You are conducting a study to determine if there is a significant difference between average adult…

A: Solution: State the hypotheses. Null hypothesis: That is, there is no significant difference…

Q: A recent study examined the drinking behaviors of undergraduate college students (male and female…

A: 1. State the test hypotheses. Null hypothesis: H0:µ1=µ2 Alternative hypothesis: H1:µ1≠µ2 1.…

Q: Use the following information to answer the question. A random sample of 54 students from Cabrillo…

A: we have give that  sample size(n)=54  , mu=20  ,sigma =5 and sample mean =21

Q: About 130,000 high school students took the AP Statistics exam in 2010. The free-response section of…

A: We have to find confidence interval for given data..

Q: The average American college student watches three hours of YouTube per day. I want to know if…

A: 1) Since population sd is unknown, use one sample t test. 2) Two way ANOVA between subjects

Q: The average score in the entrance examination in Mathematics at SRNHS is 80 with a standard…

A:

Q: Two additives to Portland cement are being tested for their effect on the strength of concrete. 21…

A: We have given that  Sample Variance 1 (s_1^2)(S12​) = 1705.691705.69 Sample Size 1 (n_1)(n1​) =…

Q: Using Excel, conduct a t-test (at the alpha = 0.01 significance level) on whether the mean of X2 is…

A:

Q: A real estate appraiser wanted to compare average house values in Tamworth and Glen Innes. The table…

A:

Q: The local school board has instituted a book rewards program intended to encourage third graders to…

A: Given Information: The average score on this exam among third graders is 98. i.e., μ0=98 Sample size…

Q: A certain type of plastic sheeting is supposed to have a true mean thickness of 171 mils. Engineers…

A: From the provided information, The hypotheses are as follow: H0: µ = 171 Ha: µ ≠ 171 Level of…

Q: A news article reported that college students who have part-time jobs work an average of 15 hours…

A:

Q: A student wants to know if women on average run marathons more slowly than men. The student plans to…

A: Given Information : A student wants to know if women on average run marathons more slowly than men.…

Q: Consumer Reports stated that the mean time for a Chrysler Concorde to go from 0 to 60 miles per hour…

A: a) Null and alternative hypotheses: The hypothesis which is tentatively fixed up under and tested…

Q: Find test statistics: Find P-value: Conclusion: Construct a confidence interval suitable for…

A: As per our guidelines, we are allowed to answer first three sub-parts only. Thanks Given Data :…

Q: Using Excel, conduct a t-test (at the alpha = 0.01 significance level) on whether the mean of X1 is…

A: Given: Significance level α=0.01 To test whether the mean of X1 is equal to 100.

Q: A psychologist examined the effect of chronic alcohol use/abuse on memory. In this experiment, a…

A: From the provided information,

Q: A nutrition store in the mall is selling "Memory Booster," which is a concoction of herbs and…

A: Solution: Given information: n= 16 Sample size M= 24  Sample mean μ= 20  Population meanSS= 960 sum…

Q: A normal population has a mean of μ = 25 on a communication effectiveness scale. After receiving a…

A: From the provided information, Sample size (n) = 4 Level of significance (α) = 0.05

Q: . Do the sample data support the conclusion that the Memory Booster has a significant "booster"…

A: Answer:-  Our hypothesis is, H0 : u=20   vs   H1 : u>20 Given that, n=16 xis 26 Variance=64…

Q: ss of the drug, a researcher selects a 20 children diagnosed with the disorder cach child's…

A: 1) a researcher selects a sample of n=20 children diagnosed with the disorder 2) The data show an…

Q: between statistical significance and practical importance?  a. This year, 360 of 440 statistics…

A: Given  Which best illustrates the distinction between statistical significance and practical…

Q: A random sample of monthly gasoline prices was taken from 2005 and from 2011. For 2005, it shows…

A:

Q: Consumer Reports stated that the mean time for a Chrysler Concorde to go from 0 to 60 miles per hour…

A: Since you have posted multiple sub-parts, we will solve the first three sub-parts for you. To get…

Q: The heart rates before and after running a race (in beats per minute) of a sample of four athletes…

A: As per honor code, we will be only answering first question. 1.4)  Null hypothesis: μAfter-Before=70…

Q: T/F: An R^2 value near 100% indicates that there is a strong causal relationship between the…

A: Correlation(R): It is tell us about the relationship between the response and the predictor…

Q: Executives of a supermarket chain are interested in the amount of time that customers spend in the…

A: Given data: Mean = 35 Standard deviation = 10 Sample mean = 42

Q: 10. The t test for two independent samples - One-tailed example using tables Aa Aa Most engaged…

A: Thank you for posting this question. Since it contains multiple sub-parts, I will answer first three…

Q: - A researcher is testing the effectiveness of a new herbal supplement that claims to nprove memory…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: 2. Monica is currently teaching basic mathematics at a university. She wants to know if there is a…

A: Given information: Students Multiple choice Problem solving Fill in the blanks 1 65 45 55…

Q: The director of student services at Oxnard College is interested in whether women are just as likely…

A: (a)

Q: The null hypothesis for a repeated-measures test states O cach individual will have a difference…

A: Repeated measures design is known as a design that includes numerous measures of a similar variable…

Q: A repeated-measures analysis of variance for a study comparing three treatment conditions with a…

A: Given information 3 treatments n = 20 participants F-ratio = 6.40 P-value = 0.0075(Using Excel = F.…

Q: A researcher hypothesizes that older adults will learn most effectively with a constant background…

A: Given : mean achievement score for each group. Here, we want to test mean of three group are same or…

Q: on the PGA Tour (the men's professional golf tour)? A sample of 20 tournament scores from LPGA…

A: Given s12=2.21182 s22=2.46232 n1=30 n2=20 Where, s is sample standard deviation and n is sample…

Q: Your company wants to improve sales. Past sales data indicate that the average sale was $100 per…

A: The hypotheses for the test is given below: Null hypothesis: H0: µ = 100. That is, the training has…

Q: In a 4-week study about the effectiveness of using magnetic insoles to treat plantar heel pain,…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: The herbal supplement ginkgo biloba is advertised as producing an increase in physical strength and…

A: Given : n = 30 μ = 15M= 17.4SS = 1260

Q: Professor Jones wants to test his new treatment for obsessive compulsive disorder (OCD). Scores on a…

A:

Q: A one-sample z-test compares a sample with 50 participants with mean 83 to a population with mean 80…

A: