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It is a proposed explanation, assertion, or assumption about a population parameter or about the distribution of a random variable. A. decision B. Statistics C. probability D. hypothesis
D. hypothesis
Which of the following population parameters is used as symbol for the mean or average population? A. 𝜎 B. 𝜇 C. 𝜌 D. 𝑥
B. 𝜇
In a right-tailed test, the rejection lies in the ________ tails of distribution. A. up B. left C. right D. down
C. right
If the variance is known, what test statistic is appropriate? A. t-test B. z-test C. two-tailed test D. one-tailed test
B. z-test
Which of the following symbols is NOT needed when t-test is used in computing values? A. 𝑛 B. μ C. 𝜎 D. 𝑠
C. 𝜎
An insurance company reported that 30% of those persons involved in minor traffic accidents this year have been involved in at least one traffic accident in the last three years. Believing it was too large, an advisory group decided to investigate this claim. Determine the value of the population proportion. A. 0.28 B. 0.30 C. 3.57 D. 60.0
B. 0.30
A research conducted on a certain company last year revealed that 25% of the employees prefer drinking milk tea than coffee during break time. The 16 Company has decided to give free milk tea during break time. In a recent study, out of 100 randomly sampled employees, 28% said that they would rather drink milk tea than coffee.What is the value of the hypothesized population proportion? A. 0.25 B. 0.28 C. 0.75 D. 100
A. 0.25
Liliw Senior High School wants to increase its reading comprehension rate of 9% for Grade 11 students from the previous year. The school re-evaluated its reading comprehension rate using a random sample of 156 students and found the reading comprehension rate at 10%. Test the claim at 10% level. What is the level of significance of the given problem? A. 0.01 B. 0.05 C. = 0.1 D. = 0.5
C. = 0.1
If the points on the scatter graph rise from left to right, then the variables involved have a ______ correlation. A. moderate C. positive B. negligible D. zero
C. positive
Which of the following is the first step in computing Pearson’s sample correlation coefficient r ? A. Complete the table. B. Construct the table. C. Get the sum of all entries in all columns. D. Substitute all the values obtained by all summations.
B. Construct the table.
Which of the following describes an alternative hypothesis using two-tailed test? A. 𝐻𝑎=100 C. 𝐻𝑎>100 B. 𝐻𝑎≠100 D. 𝐻𝑎<100
B. 𝐻𝑎≠100
When is a Type I error committed? A. We reject a null hypothesis that is true. B. We reject a null hypothesis that is false. C. We fail to reject a null hypothesis that is true. D. We fail to reject a null hypothesis that is false.
A. We reject a null hypothesis that is true.
If the researcher wishes to test the claim that the mean of the population is 75, the appropriate null hypothesis is A. 𝜇≤75 B. 𝜇≥75 C. 𝜇≠75 D. 𝜇=75
D. 𝜇=75
Which is the correct alternative hypothesis for one-tailed test? A. μ=25 B. μ≠25 C. μ≥25 D. μ<25
D. μ<25
If in a sample n=16 selected from a normal population, 𝑥̅=56 and 𝑠=12, what statistical test is applicable to be used? A. f-test C. z-test B. t-test D. Central Limit Theorem
B. t-test
If the computed value is less than the critical value, then we ______________. A. retain the null hypothesis B. reject the null hypothesis C. support the null hypothesis D. fail to reject the null hypothesis
D. fail to reject the null hypothesis
If the t-computed value is 2.430 and the critical value is 2.011, what will be the decision? A. Reject the null hypothesis B. Support the null hypothesis. C. Reject the alternative hypothesis. D. Do not reject the null hypothesis.
A. Reject the null hypothesis
A one sample t-test is conducted on Ho: μ = 81.6. The sample has a sample mean = 84.1, s = 3.1, n = 25, and α = .01. State your null and alternative hypotheses. A. H0: μ = 81.6 C. H0: μ < 81.6 Hₐ: μ ≠ 81.6 Hₐ: μ > 81.6
A. H0: μ = 81.6 Hₐ: μ ≠ 81.6
A random sample of 101 bottles of cologne showed an average content of 4 oz. It is known that the population standard deviation of the contents is 0.22 oz. In this problem, translate the parameter into symbols. A. μ=4 C. μ=0.22 B. 𝜎=101 D. 𝜎=0.22
D. 𝜎=0.22
What is the correct alternative hypothesis in sentence form of the statement: Ha : p ≠ 0.21? A. The proportion of male in a certain barangay is 21%. B. The proportion of male in a certain barangay is fewer by 21% C. The proportion of male in a certain barangay is different from 21%. D. The proportion of male in a certain barangay has increased by 21%.
C. The proportion of male in a certain barangay is different from 21%.
What is the sample proportion if n = 740 and x = 259 A. 0.35 B. 0.50 C. 0.56 D. 0.65
A. 0.35
In a two-tailed test with 𝛼=0.025, the z-computed value is 2.014. What are the critical values? A. ±2.575 C. ±1.96 B. ±2.33 D. ±1.645
B. ±2.33
For a two-tailed test with sigma unknown, n= 16, and 𝛼=0.05, what is the critical value of t? A. ±2.092 B. ±2.131 C. ±2.145 D. ±2.145
B. ±2.131
In a left-tailed test with 𝛼=0.01, the critical value of z is: A. -2.576 B. -2.33 C. -1.960 D. -1.645
B. -2.33
Given: 𝐻𝑜: μ = 8.6 𝐻𝑎: μ > 8.6 The study has a sample mean of 9.1 and a standard deviation of 2.1 conducted among 25 respondents. What is the computed value? A. -1. 190 C. 0. 567 B. – 0. 567 D. 1.190
D. 1.190