Homework Answers
a) In order for t procedure to be appropriate the data should be bell shaped, symmetrical about the mean.
b) As sample size is 150>30, so using central limiting theorem we can use z procedure as well as t procedure in this case.
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The sample size is 150 values.
4. (2 points) Consider the restrictions for using the t...
Answer the following questions (1/2 point each, 4 points total): a. When should we use a...
Answer the following questions (1/2 point each, 4 points total): a. When should we use a t-test? b. When should we use a single-sample t-test? c. Why do we calculate standard deviation using N-1 rather than N like we used to? d. What is the standard error of the mean? e. Does it get larger or smaller as our sample size increases? Why? f. Does the critical value of t (i.e, the score you need for your results to be...
NEED HELP WITH EXERCISES 1-4 One sample t Test we are mow going to use Excel to test a l it the average cholesterol level of patients in in cholesterol level of 20 random people from vario on one...
NEED HELP WITH EXERCISES 1-4
One sample t Test we are mow going to use Excel to test a l it the average cholesterol level of patients in in cholesterol level of 20 random people from vario on one given sample We would like to know to 200 and for shat reason we collec or patients in intens based n various intensive care units Cholesterol level 1S4, 168, 134,201,208,220.225,228,201207,168,211,203,254,268198 out our data in colurmn A. In Cells A3 A22 we...
Using the dataset that you used for the midterm (Find it on the Blackboard), do the following: 1) (4 points) Submit the values for items a to e in the table below: mean, sample size, standard deviatio...
Using the dataset that you used for the midterm (Find it on the Blackboard), do the following: 1) (4 points) Submit the values for items a to e in the table below: mean, sample size, standard deviation, and 95% confidence interval for mean. (SPSS Command: Analyze/Descriptive Statistics/Explore) Variable Statistic Height Mean 71.2 Sample Size N 999 Standard Deviation 2.913 95% Confidence Interval for Mean Lower Bound 71.02 Upper Bound 71.38 2) (4 points) Assume that you want to test whether...
2) In addition to meeting the Randomization Condition and the Independence Assumption, a1 Sample t-Test must...
2) In addition to meeting the Randomization Condition and the Independence Assumption, a1 Sample t-Test must also meet the Nearly Normal Condition. We check the Nearly Normal Condition by making a histogram of the distribution. Describe what the histogram must look like to meet the Nearly Normal Condition for each scenario below. (3 points) ) The sample size is very small les than 15). b) The sample size is moderate (between 15 and 40) c) The sample size is large...
When using the pooled variance t-test, if the sample size for the first group is 16...
When using the pooled variance t-test, if the sample size for the first group is 16 and the sample size for the second group is 25, how many degrees of freedom do we have when finding the critical values?
1. 036 points value: Consider the following data from two independent populations (with unequal variances). Sample...
1. 036 points value: Consider the following data from two independent populations (with unequal variances). Sample #1 Sample #2 Sample Standard Deviation 18 12 Sample Size 10 12 If an independent samples t-test is to be conducted, the appropriate degrees of freedom to use is
Consider the following data from two independent populations (with unequal variances). Sample Standard Deviation Sample Size...
Consider the following data from two independent populations (with unequal variances). Sample Standard Deviation Sample Size Sample #1 18 10 Sample #2 12 12 If an independent samples t-test is to be conducted, the appropriate degrees of freedom to use is? *****Answer is not 20****
Consider the following hypotheses: Ho: 4 = 150 HA: H < 150 A sample of 80...
Consider the following hypotheses: Ho: 4 = 150 HA: H < 150 A sample of 80 observations results in a sample mean of 144. The population standard deviation is known to be 28. (You may find it useful to reference the appropriate table: z table or t table) a-1. Calculate the value of the test statistic. (Negative value should be indicated by a minus sign. Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal...
Given a simple linear regression model with a sample size of n = 2; The sample...
Given a simple linear regression model with a sample size of n = 2; The sample data: (y1, x1), (y2, x2) (a) State the two normal equations in terms of the sample data (b) If there is only one observation (y1, x1) in the sample, how would the two normal equations look like? (c) What conclusion can we draw from the answer in part (a) and (b)?
1) Consider a survey of garbage production. In a sample of N households, the average household...
1) Consider a survey of garbage production. In a sample of N households, the average household generates 44 gallons of non-recyclable, non-compostable garbage per week, with a standard deviation of 23. The city's landfill is large enough to accommodate 50 gallons of garbage per week per household, and we are interesting in whether we can rule out, using a 95% confidence level, the hypothesis that the landfill is inadequate to the need. a) Is a one-sided or two-sided hypothesis test...
Answer the following questions (1/2 point each, 4 points total): a. When should we use a t-test? b. When should we use a single-sample t-test? c. Why do we calculate standard deviation using N-1 rather than N like we used to? d. What is the standard error of the mean? e. Does it get larger or smaller as our sample size increases? Why? f. Does the critical value of t (i.e, the score you need for your results to be...
NEED HELP WITH EXERCISES 1-4
One sample t Test we are mow going to use Excel to test a l it the average cholesterol level of patients in in cholesterol level of 20 random people from vario on one given sample We would like to know to 200 and for shat reason we collec or patients in intens based n various intensive care units Cholesterol level 1S4, 168, 134,201,208,220.225,228,201207,168,211,203,254,268198 out our data in colurmn A. In Cells A3 A22 we...
2) In addition to meeting the Randomization Condition and the Independence Assumption, a1 Sample t-Test must also meet the Nearly Normal Condition. We check the Nearly Normal Condition by making a histogram of the distribution. Describe what the histogram must look like to meet the Nearly Normal Condition for each scenario below. (3 points) ) The sample size is very small les than 15). b) The sample size is moderate (between 15 and 40) c) The sample size is large...
1. 036 points value: Consider the following data from two independent populations (with unequal variances). Sample #1 Sample #2 Sample Standard Deviation 18 12 Sample Size 10 12 If an independent samples t-test is to be conducted, the appropriate degrees of freedom to use is
Consider the following hypotheses: Ho: 4 = 150 HA: H < 150 A sample of 80 observations results in a sample mean of 144. The population standard deviation is known to be 28. (You may find it useful to reference the appropriate table: z table or t table) a-1. Calculate the value of the test statistic. (Negative value should be indicated by a minus sign. Round intermediate calculations to at least 4 decimal places and final answer to 2 decimal...
1) Consider a survey of garbage production. In a sample of N households, the average household generates 44 gallons of non-recyclable, non-compostable garbage per week, with a standard deviation of 23. The city's landfill is large enough to accommodate 50 gallons of garbage per week per household, and we are interesting in whether we can rule out, using a 95% confidence level, the hypothesis that the landfill is inadequate to the need. a) Is a one-sided or two-sided hypothesis test...
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