A gardener believes that the proportion of days that his garden gets rain is less than 20%. Select the hypothes test decision that would define a Type Il error. O Conclude that the true proportion of rain days is less than 20% when it is at least 20%. O Conclude that the true proportion of rain days is less than 20% when it is less than 20%. Not conclude that the true proportion of rain days is less than 20% when it is at least 20%. Not conclude that the true proportion of rain days is less than 20% when it is less than 20%. ONone of the above

A gardener believes that the proportion of days that his garden gets rain is less than 20%. Select the hypothes test decision that would define a Type Il error. O Conclude that the true proportion of rain days is less than 20% when it is at least 20%. O Conclude that the true proportion of rain days is less than 20% when it is less than 20%. Not conclude that the true proportion of rain days is less than 20% when it is at least 20%. Not conclude that the true proportion of rain days is less than 20% when it is less than 20%. ONone of the above

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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12
suppose an airline claims that it's flights are consistently on time with an average delay of most 15 minutes. It claims that the average delay is so consistent that the variance is no more than 15 minutes. Doubting the consistency part of the claim, a disgruntled traveler calculates the fray for his next 25 flights. The average delay for those 25 flights is 22 minutes with a standard deviation of 15 minutes. D) decision about hypothesis E) conclusion
64. Interpret a confidence interval: A survey organization drew a simple random sample of 625 households from a city of 100,000 households. The sample mean number of people in the 625 households was 2.30, and a 95% confidence interval for the mean number of people in the 100,000 households was 2.16 << 2.44. True or false, and explain: a. We are 95% confident that the mean number of people in the 625 households is between 2.16 and 2.44. b. We are 95% confident that the mean number of people in the 100,000 households is between 2.16 and 2.44.
D) reject/fail to reject. is not/ is E) is not/ is reject/ support equal/ greater than / greater than or equal / not equal/ less than / less than or equal
3. Consider the following competing hypotheses: (You may find it useful to reference the appropriate table: z table or ttable) Hypotheses: Hg: HD s 6; HA: HD > 6 Sample results: 01:05:54 d = 8.2, sp = 7.2, n = 11 The following results are obtained using matched samples from two normally distributed populations: a. Calculate the value of the test statistic, assuming that the sample difference is normally distributed. (Negative value should be indicated by a minus sign. Round final answer to 3 decimal places.) Test statistic b. Find the p-value. O pvalue Picture 0.10 0.05 Picture p-value < 0.10 O 0.025 Picture p-value < 0.05 0.01 Picture p-value < 0.025 O p-value < 0.01
A paired and independent- sample t-test each had degrees of preedom (df)=33.What are the sample sizes? A.paired-samples t-test 34/independnt-samples t-test 35 B.paired-samples t-test 32/independent-samples t-test 31 C.paired-smaples t-test 35/independent- samples t-test 34
5) There are two car dealers in town. The mean monthly sales at Smith Auto and Jones Cars are about the same. However, Kevin Smith, owner of Smith Auto, believes his sales are more consistent. a) State the Hypothesis to show the variation in the monthly sales is lower at Smith Auto than Jones Cars s. b) To test the hypothesis, you collect monthly sales data for the two companies. The data appears below. Use JMP to test the hypothesis of part a). c) Using alpha= 0.05, draw a conclusion for the hypothesis test and state the conclusion in the context of the problem. Dealership Sales Smith Auto 98 Smith Auto 78 Smith Auto 54 Smith Auto 57 Smith Auto 68 Smith Auto 64 Smith Auto 70 Jones Cars 75 Jones Cars 81 Jones Cars 81 Jones Cars 30 Jones Cars 82 Jones Cars 46 Jones Cars 58 Jones Cars 101
9) If the sample size is multiplied by 4, what happens to the standard deviation of the distribution of sample means? A The standard error is decreased by a factor of 4. B The standard error is halved. C The standard error is doubled. D The standard error is increased by a factor of 4. It is mutiple choice
A data set includes data from student evaluations of courses. The summary statistics are nequals=8585, x overbarxequals=3.423.42, sequals=0.540.54. Use a 0.010.01 significance level to test the claim that the population of student course evaluations has a mean equal to 3.503.50. Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim.
2. A normal level glucose control (80- 105 mg/dL) was tested at the beginning of the morning shift at a local hospital. The reagent used was of the same lot number, the instrument operator was the same, and all conditions were controlled to ensure the results would not be affected by environment or by any condition that could be controlled. The following values were recorded in 12 consecutive days. Calculate the Standard error of the mean (SEM) Days Glucose levels (mg/dL) 92 1 93 92 90 4. 89 87 8 89 88 7. 8. 6. 10 92 88 961 11 12 W TOSHIBA
Define a Type 1 error and a type 2 error and explain the consequences of each.
How would a person set up the hypotheses if they wanted to test the claim: the mean length of a Pyramid Lake trout is greater than 21 inches? What would be a type Il error in this case? O State the mean length of a Pyramid Lake trout is greater than or equal to 21 inches when in fact the mean length of a Pyramid Lake trout is less than 21 inches. State the mean length of a Pyramid Lake trout is less than or equal to 21 inches when in fact the mean length of a Pyramid Lake trout is greater than 21 inches. State the mean length of a Pyramid Lake trout is less than 21 inches when in fact the mean length of a Pyramid Lake trout is greater than or equal to 21 inches. O State the mean length of a Pyramid Lake trout is greater than 21 inches when in fact the mean length of a Pyramid Lake trout is less than or equal to 21 inches.