If I have a sample of 20 people what is my T-threshold for a two-tail test and an alpha of 0.1 percent?
Q: Adrian hopes that his new training methods have improved his batting average. Before starting his…
A: The sample size for population 1 is 80, with an average batting proportion is 0.575, and sample size…
Q: Previously , 10.1% of workers had a travel time to work of more than 60 minutes . An urban economist…
A: Given information n = 90, x= 15, p=0.101 Sample statistic is given by
Q: You compare the height (cm) and weight (kg) of 5 adult women. You get the following results: height…
A: From the given data, Height (X) Weight (Y) XY X2 Y2 152.4 54 8229.6 23225.76 2916…
Q: If I have a sample of 25 people what is my T-threshold for a two-tail test and an alpha of 0.05…
A: Given: Sample size (n)=25 Level of significance α=0.05%
Q: You are testing the null hypothesis that there is no relationship between two variables, X and Y.…
A: Obtain the value of the test statistic. The value of the test statistic is obtained below as…
Q: he DASS-21 questionnaire is a validated measure of depression, anxiety, and stress. For the general…
A: Given that the mean for the anxiety for the population is 4.2 As it scales from the questions 0 to…
Q: 2. Neuroscience researchers examined the impact of environment on rat development. Rats were…
A:
Q: he test of H0: = 19 against Ha: ≠ 19 based on an SRS of 15 observations from a Normal population…
A: Given: H0:μ=19 H1:μ ≠19 SRS = 15 T= -1.75
Q: You are performing a left-tailed matched-pairs test with 11 pairs of data. If α=.01, find the…
A: Given: n = 11 ∝ = 0.01 Thus, we have degrees of freedom = n-1 = 11-1 = 10
Q: 6.- The day after Thanksgiving-called Black Friday–is one of the largest shopping days in the United…
A: A confidence interval (CI) is a type of estimate computed from the observed data. It gives a range…
Q: 9% of all Americans suffer from sleep apnea. A researcher suspects that a higher percentage of those…
A: 1)
Q: A(n) was performed to assess whether mean HR differed significantly for a group of 10 participants…
A: Given Information: Group 1: Participants who consumed no caffeine Group 2: Participants who…
Q: population variance is 3.68. Would this sample be considered significantly different from the…
A:
Q: Interpret the following statement regarding the statistical findings of a research study. “61% (n =…
A: Introduction: The outcome of a study involving low-carbohydrate and low-fat diets is given.
Q: The data in the table below presents the hourly quantity of production for three lines of production…
A: 1). The ANOVA for the given data is given below: Null Hypothesis: The means of all three processes…
Q: If I am conducting a one-tailed z test and my risk is 1% what should my critical value be?
A: From the provided information, The level of significance (α) = 1% that is 0.01 The test is one…
Q: 10% of all Americans suffer from sleep apnea. A researcher suspects that a higher percentage of…
A:
Q: Previously , 11.5 % of workers had a travel time to work of more than 60 minutes . An urban…
A: Given: x=18 n=85 let the level of significance be α=0.05. let the null hypothesis be H0: p=0.115.…
Q: 10% of all Americans suffer from sleep apnea. A researcher suspects that a different percentage of…
A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…
Q: A study was conducted to determine whether there is a significant difference in the population mean…
A: A study was conducted to determine whether there is a significant difference in the population mean…
Q: Lisa wants to determine if graduates from her collegeearn different incomes than do graduates from…
A: Let μ denotes the population mean income of the graduates from Lisa's college. The average income is…
Q: USA Today reported that about 47% of the general consumer population in the United States is loyal…
A: It is given that the population proportion is 47% and the level of significance is 0.01.
Q: The recidivism rate for convicted sex offenders is 16%. A warden suspects that this percent is…
A: Denote p as the true recidivism rate of sex offenders, who are also drug addicts. For this study, we…
Q: A producer of chocolate candy bars has developed an improved recipe for one of their most popular…
A: N1 = 10 df1 = 10-1 = 9 M1 = 7.8 S1 = 1.2 N2 = 10 df2 = 9 M2 = 8.1 S2 = 1.6 t-statistics = ?
Q: Which study will require a larger sample size, one done with 80% power or 90% power when alpha (type…
A: Type I error One study is done with 80% power and the other at 90% power.The population, expected…
Q: Past records indicate that 45% of students eat breakfast while driving to school. A campaign to…
A: Solution: State the hypotheses Null hypothesis: That is, the proportion of students eats breakfast…
Q: The recidivism rate for convicted sex offenders is 8%. A warden suspects that this percent is lower…
A: Z-test for population proportion will be used. The hypotheses can be constructed as: H0: p = 0.08…
Q: 13% of all Americans suffer from sleep apnea. A researcher suspects that a different percentage of…
A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…
Q: The results of a study that used an independent samples t-test was t(28) = 2.14, p = .01. Based on…
A: t(28) means that degree of freedom = 28 Now, degree of freedom for a t-test one sample case = n-1.
Q: A one sample t test has n = 12. If using a two-tail test (proportion in two tails combined) with an…
A: Sample size n=2.201 Significance level α=0.05 The degrees of freedom n-1=12-1=11
Q: Dr. Romanoff reported the following in a journal: “F (5, 106) = 10.09, p = .04.” Should Dr.…
A: It is given that p- value is 0.04 and the level of significance is 0.05.
Q: Data from the Department of Motor Vehicles indicate that 80% of all licensed drivers are older than…
A: From the provided information, Sample size (n) = 50 32 were older than 25 years and the other 18…
Q: A farmer wants to test the effectiveness of a pest control method in allowing strawberry blooms to…
A: The value of the test statistic is and the objective is to give the approximate p-value to the…
Q: Mr. Mitchell, a famous trainer in the tri-state region, claims that his new fitness training program…
A: Solution: The table showing respondents' weights pre-fitness program and after the program is given.…
Q: In a test of H0: p = .43 versus Ha: p ≠ .43, a sample of size 1500 leads to a p-value of 0.087.…
A: Here from the given hypothesis test and the p value we need to arrive at the correct conclusion from…
Q: A researcher conducts an independent-measures study comparing two treatments and reports the t…
A:
Q: What is the test statistic?
A: It is given that Sample size n = 8 Sample mean M = 9.8 Sample SD s = 0.4 Level of significance =…
Q: A producer of chocolate candy bars has developed an improved recipe for one of their most popular…
A: Given n1=n2=100 X1-bar=7.8 X2-bar=8.1
Q: The recidivism rate for convicted sex offenders is 16%. A warden suspects that this percent is…
A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…
Q: Dr. Stevenson reported the following in a journal: “F (4, 106) = 10.09, p = .04.” Should Dr.…
A:
Q: You are performing a left-tailed matched-pairs test with 5 pairs of data. If α=.05α=.05, find the…
A: It is given that, sample size, n=1 degree of freedom =n-1=5-1=4 α=.05 and we are performing the left…
Q: sample 1 (M cars) : n1 = 24, X ̄1 = 29.8, s1 = 2.56 sample 2 (J cars) : n2 = 28, X ̄2 = 27.3, s2 =…
A: Given Data : For Sample 1 x̄1 = 29.8 s1 = 2.56 n1 = 24 For Sample 2…
Q: USA Today reported that about 47% of the general consumer population in the United States is loyal…
A:
Q: The 2006 Statistical Abstract of the United States reports on a survey that asked a national sample…
A: Given that Sample size (n) = 80000 Suppose that one-third of all American households own a pet…
Q: A random sample of 15 families representing three different Scandinavian countries has been observed…
A: Given: Sweden Norway Denmark 10 11 7 9 10 5 4 5 2 2 2 0
If I have a sample of 20 people what is my T-threshold for a two-tail test and an alpha of 0.1 percent?
Step by step
Solved in 2 steps with 1 images
- You are performing a right-tailed matched-pairs test with 17 pairs of data.If α=.025 find the critical value, to two decimal places.15% of all Americans suffer from sleep apnea. A researcher suspects that a lower percentage of those who live in the inner city have sleep apnea. Of the 322 people from the inner city surveyed, 42 of them suffered from sleep apnea. What can be concluded at the level of significance of αα = 0.01? For this study, we should use Select an answer z-test for a population proportion t-test for a population mean The null and alternative hypotheses would be: Ho: ? p μ Select an answer > < = ≠ (please enter a decimal) H1: ? μ p Select an answer ≠ > = < (Please enter a decimal) The test statistic ? t z = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is ? > ≤ αα Based on this, we should Select an answer reject accept fail to reject the null hypothesis. Thus, the final conclusion is that ... The data suggest the population proportion is not significantly smaller than 15% at αα = 0.01, so…What would our cutoff Z-score be if we want to do a two-tailed test and use an alpha of .01?
- A researcher conducted a t-test for independent samples to evaluate the mean difference between two treatment conditions and obtained t(48) = 4.00. What would be the computed F, if the outcomes of this study were evaluated by one-actor ANOVA for independent samples?I'm interested in comparing the GPA of students at a junior college where I teach, with the national GPA average of all junior college students. I randomly select 22 students from my school (N = 22) and compare the mean of the 22 students with the national average. When I compare the two means I end up with a t-value of 2.761. Using an alpha value of .01, for a two-tailed test, what critical value do I find in Appendix B? (answer must have 3 decimal places)You are performing a left-tailed test with a sample size of 32.If α=.005, find the critical value, to four decimal places.tα=
- A company that makes basketballs has the motto, "Our basketballs are ready to play." Therefore, it is important to the company that the basketballs are inflated with the proper amount of air when shipped. Most basketballs are inflated to 7 to 9 pounds per square inch. From a set of calibration data, X = 8.03 and R=0.57. Recently the company selected a random basketball from its production line at four different time periods over its normal production day. The results were listed in the accompanying table. Complete parts a through c. Click the icon to view the data table. Click the icon to view the factors for calculating control limits. a) Create an x-bar chart based on the calibration data statistics for these 6 samples. Choose the correct graph below. OA. O B. 2 3 4 5 6 Group 1.6-1 1.2- 0.8- 0.4- 1 2 3 4 5 Group 6 Q UCL CL LCL Q Ucha CL 8.6 8.4- b) Create an R chart based on the calibration data statistics for these 6 samples. Choose the correct graph below. O A. O B. LCL 8.24 8 7.8…A researcher wants to know if male and female college students differ with regard to their GPAs. She randomly gets 16 male and 16 female college students to report their GPAs. The males reported a mean GPA of 3.05 with a SS = 3.75. The females reported a mean GPA of 3.1 with a SS = 2.4. You are going to be conducting an independent samples t-test. You will be conducting a two-tailed test with alpha α=.05. What is the critical t-value(s) for this test?A physical therapist wanted to know whether the mean step pulse of men was less than the mean step pulse of women. She randomly selected 54 men and 70 women to participate in the study. Each subject was required to step up and down a 6-inch platform. The pulse of each subject was then recorded. The following results were obtained. Two sample T for Men vs Women N Mean StDev SE Mean Men Women 98% CI for mu Men - mu Women (- 12.20, - 1.00) T-Test mu Men = mu Women (vs H2 O C. Ho: H1 = H2; Ha: H1 #H2 (b) Identify the P-value and state the researcher's conclusion if the level of significance was a = 0.01. What is the P-value? P-value =
- Two separate samples receive two different treatments. The first treatment group (N = 9) has a mean of 50 with SS = 710. The second treatment group (N = 6) has a mean of 60 with SS = 460. Is the second treatment group significantly larger than the first? What is the effect size?10% of all Americans suffer from sleep apnea. A researcher suspects that a lower percentage of those who live in the inner city have sleep apnea. Of the 369 people from the inner city surveyed, 22 of them suffered from sleep apnea. What can be concluded at the level of significance of αα = 0.01? For this study, we should use Select an answer t-test for a population mean z-test for a population proportion The null and alternative hypotheses would be: Ho: ? μ p Select an answer = < ≠ > (please enter a decimal) H1: ? μ p Select an answer > ≠ < = (Please enter a decimal) The test statistic ? z t = (please show your answer to 3 decimal places.) The p-value = (Please show your answer to 4 decimal places.) The p-value is ? > ≤ αα Based on this, we should Select an answer reject accept fail to reject the null hypothesis. Thus, the final conclusion is that ... The data suggest the population proportion is not significantly smaller than 10% at αα = 0.01, so…The local Hannaford was tracking the proportion of customers who bought flour in their stores. In mid-March they found that 65% of customers were buying flour when it was available. They want to know if that percentage has decreased now that flour is more readily available. Their hypotheses are: Ho: ρ ≥ .65 and Ha: ρ < .65. They sample 200 customers and found that 120 of them bought flour. What is the computed test statistic? Calculate the z or t, whichever is appropriate, and give the result rounded to 2 decimal places. If it's a negative number, put the negative sign before the number with no spaces between it and the number.
