With a = .01, what is the critical t value for a one-tailed test with n = 30? O t = 2.457 Ot = 2.462 Ot = 2.756 Ot = 2.750
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- 65 homeless people in San Jose were asked their age. The sample mean age was 33.2 years. Let x be a random variable representing ages of homeless people in San Jose. Assume that x has a normal distribution and o = 7.3 years. Do the data indicate that the mean age of the population of homeless people in San Jose is less than 35 years old? Use a = 0.05. Identify the following in your answer. 1. Identify the null hypothesis Ho and alternate hypotheses H, for the problem. 2. Identify the sample statistic, test statistic, p-value and calculator key used: Sample Statistic (sample mean) (Stated in problem) = Test Statistic (z) (Round to two decimal places) %3D P-value: (Round to four decimal places) = Calculator key used: 3. Identify the significance level and determine if you reject or fail to reject the null hypothesis. significance level = Do you reject or fail to reject Ho ? 4. State your conclusion. Upload your answer. Remember you can only upload one document. Upload Choose a FileThe test statistic, t, is - 22.67. (Round to two decimal places as needed.) The P-value is 0.000. (Round to three decimal places as needed.) State the conclusion for the test. A. Reject the null hypothesis. There is sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda. B. Fail to reject the null hypothesis. There is not sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda. C. Fail to reject the null hypothesis. There is sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda. D. Reject the null hypothesis. There is not sufficient evidence to support the claim that the cans of diet soda have mean weights that are lower than the mean weight for the regular soda.A sample of n = 20 scores is transformed in to z-scores. The mean for the 20 z-scores is ____? If a researcher reports t(18) = 1.30, p > .05 for a two-sample independent-measures experiment, the results were significant. T or F?
- The value obtained for the test statistic, z, in a one-mean z-test is given. Also given is whether the test is two tailed, left tailed, or right tailed. Determine the P-value. Round to four decimal places, as needed. A left-tailed test: Z = -1.17A psychologist would like to know whether the 4 seasons have any consistent effect on Amazon shopping. In the middle of each season, a psychologist selects a random sample of n=23n=23 students. Complete the following, ANOVA summary table (α=0.10α=0.10). Round values for SS and MS to 3 decimal places as needed. Round p-value to 4 decimal places. Source SS df MS F P Between 1.339 Within 1090.32 TOTALFor each of the following hypotheses in Questions 6-8, (i) provide the p-value (or its bounds) and (ii) draw a basic conclusion (REJECT or DO NOT REJECT only) with respect to Ho with 99% confidence. Handwritten notes are not necessary for these questions.
- In the experiment, you repeated measurements 8 times for a resistor. After data processing, you determined that the standard deviation of the measurement is 2.80. What is the 95% confidence range of the result? O ±2.8N +1.94N +5.45N O ±8NTraumatic Brain Injuries have been shown to affect brain volume. A psychologist measures the brain volume of N=8 TBI patients at 2 months and 12 months after their injuries. Evaluate the results of her data using α = .052tail. **Attached Image** a. State the hypotheses b. Show how the t was calculated using the values from the SPSS printout. c. What is Cohen’s d?What is the critical value? A. 2.33 B. 2.492 C. 2.575 D. 2.797
- You have a really annoying stapler that seems to randomly jam. On any given attempt to staple, it seems to independently jam 18.1% of the time. 360 attempts were made use the stapler. a) Find the mean and standard deviation for the number of jammed staples out of 360 attempts. Mean: Standard Deviation (rounded to 2 decimals): b) Does the normal approximation apply? Is the success / failure condition met (using a cutoff of 5)? No Yes c) Use the normal distribution (with continuity correction) to find the probability that your stapler will jam more than 79 times out of 360 attempts. Use the rounded standard deviation in your calculation. z-score (to 2 decimals) = probability (to 4 decimals, using the rounded z-score)During an economic crisis, the average value of homes in a community of 36 homes lost $9445 with a standard deviation of $1300. The average home value in the region lost $8990. Was this community of 36 homesunusual? Use a t-test to decide if the average loss observed was significantly different from the region value. Use a level of significance α=0.05. Identify the hypotheses for the test. H0: μ ▼ not equals≠ equals= greater than> less than< nothing HA: μ ▼ equals= greater than> not equals≠ less than< nothing The test statistic is nothing. (Round to two decimal places as needed.) The P-value is nothing. (Round to three decimal places as needed.) What is the conclusion of the test? Was the average loss observed significantly different from the region value? ▼ Reject Fail to reject the null hypothesis because the P-value is ▼ greater less than the given significance level, and conclude that the…Find the critical value to for the confidence level c = 0.99 and sample size n = 9. tc= Click the icon to view the t-distribution table. (Round to the nearest thousandth as needed.)