Which minimum sample size is recommended for a z-test for the difference in means?a) 5b) 10c) 15d) 20e) 25f) 30

Which minimum sample size is recommended for a z-test for the difference in means? a) 5 b) 10 c)…

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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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The following are descriptive statistics except a) 95% of the sample has height between 66 and 74 inches b) Based from a study, smoking increases the risk of lung cancer c) the chance of a newborn being female is 50% d) Last year's attendance at a basketball game was 883452
What is the value of the test statistic?A) 1.85B) 3.704C) 2.39D) 4.100E) 2.556
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To make a decision about closing time, a fast food restauranthas recorded data on the number of customers using theirdrive up window between 10:00 and 11:00 pm on Sundaythrough Thursday. A summary is shown in the table. What is the inter-quartile range for these data?A) 3 B) 4 C) 5 D) 6 E) 7Number ofcustomersRelativefrequency1 0.082 0.103 0.144 0.125 0.156 0.107 0.208 0.059 0.06
Random samples of size 36 are taken from an infinite population whose mean is 80 and standard deviation is 18. The standard error of the sample mean is then: A) 18 B) 15 C) 3 D) 2
10 -)) It is known that 25% of the customers who shop more than 200.000 YTL in the big shopping mall, do their shopping in installments. Accordingly, what is the standard error of the sample distribution of the rates for 49 customers who shopped more than 200,000 YTL?A) 0.0012 B) 0.34 C) 0.045 D) 0.0011 E) 0.062
Consider a population of 800 values that are normally distributed with a mean of 80 and standard deviation of 5. To the nearest integer, how many values are between 75 and 83? a) 454 b) 567 c) 665 d) 756
What happens to the minimum sample size needed to estimate p when the acceptable margin of error increases? O A. the minimum sample size does not change B. the minimum sample size decreases C. the minimum sample size increases
3- What is the standard z value corresponding to the sample mean 120 in a distribution with a mass mean of 60 and a standard deviation of 4? O A) 5 O B) -15 O C) 15 O D) 0 O E) 5
a) State whether the following is a discrete or continuous random variable. i. Number of seeds in a tomato ii. The number of litres of water used per household iii. The ages of children in a preschool b) Determine the sampling methods used in each of the scenarios below i. Select every 9th candy bar from a production line to check its weight ii. Group t-shirts by colors and select t-shirts at random from within each group in proportion to the number of t-shirts that make up that group. iii. Use random number tables to select 15 students from a class. iv. Select 8 white cars, 5 blue and 3 red cars. v. Name one advantage of the sampling method in ii)
The data below gives the lengths in millimeters of three varieties of the tropical flower Heliconia, which are fertilized by different species of hummingbird on the island of Dominica. Perform an Anova test to compare the means lengths of the flowers for the three species. H. bihai H. caribaea red H. caribaea yellow 46.8 37.8 34.5 46.4 37.4 35.7 46.9 38 35 47.4 38.9 36.5 48.4 38 36.7 48 41.5 36 50.2 41.9 37 i. State the null and alternative hypothesis j. Give the p-value k. Give a conclusion for the hypothesis test
14 -It is known that the average of blood pressure values in a community is normally distributed with 130mmHg and the standard samas with 25mmHg. What is the percentage of people with blood pressure between 110-140 mmHg?A)23,55 B)41,58 C)34.99 D)50.61 TO)44.35

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Which minimum sample size is recommended for a z-test for the difference in means? a) 5 b) 10 c) 15 d) 20 e) 25 f) 30