Statistics and Probability

• H ≠ 100


  Which of the following describes an alternative hypothesis using two-tailed test?
• 2.365


  In a one-tailed test, in which critical value listed below will the computed value z of 2.313 fall in the acceptance region?
• The average of 24 years


  Which is the perimeter in the given situation below? "The average age of 10 college students is 24 years"
• The percentage of employee


  A research conducted on a certain company last year showed that 25% of the employees would rather drink coffee than softdrinks during break time. Which choice best represents a parameter?
• σ = 0.22


  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. In this problem, translate the parameter into symbols.
• Ha: μ ≠7 


  Which of these is a correct alternative hypothesis for a two-tailed test?
• 16


  A simple random sample of 150 observations was taken from a large population. The sample average and the sample standard deviation were determined to be 70 and 16 respectively. What is the value of s?
• σ = ₱62.00


  In the given situation below, identify the population standard deviation. "In a recent survey, the average amount of money a college student gets is ₱200.00 with standard deviation of ₱62.00. A teacher feels that the average amount is higher. She surveys 80 randomly selected students and finds that the average amount is ₱245"
• 10 


  What is the sample standard deviation if a simple random sample of 220 students is drawn from a population of 2,740 college students? Among the sampled students, the average IQ score is 115 with standard deviation of 10.
• 2.33


  In a right-tailed test with α = 0.01, the critical value of z is?
• ±2.101


  For a two-tailed test with variance unknown, n = 19, and α = 0.05, what is the critical value?
• 1.782


  What is the critical value if the population variance is unknown, n = 13, α = 0.05 and it is a one-tailed test?
• z ≤ -1.645 or z ≥ 1.645


  Given a two-tailed test, population variance is known, and α = 0.10, what is the critical region?
• -2.330


  In a left-tailed test with α = 0.01, the critical value of z is?
• -2.479


  Given a left-tailed test, population standard deviation is unknown, n = 27, α = 0.01, what is the critical value?
• T-test


  Given: Ho: μ=7.25 Ha: μ<7.25. The study has a sample mean of 8.1 and a standard deviation of 1.18 conducted among 15 respondents. Use α = 0.01.

  What test statistics should be used?
• -2.790


  Given: Ho: μ=7.25 Ha: μ<7.25. The study has a sample mean of 8.1 and a standard deviation of 1.18 conducted among 15 respondents. Use α = 0.01.

  What is the computed value?
• Smaller than 30


  How many samples are best when dealing with T-test?
• Z-test


  Given: Ho: μ=7.25 Ha: μ<7.25. The study has a sample mean of 8.1 and a standard deviation of 1.18 conducted among 15 respondents. Use α = 0.01.

  Which test statistic will be used if the sample is 37?
• Either T-test or Z-test 


  Which statistical method can you use when you have a normal distribution of data?
• 1.734


  What is the critical value in a one-tailed test with 5% level of significance and a degree of freedom?
• ±1.96


  Find the critical value(s) of a two-tailed Z-test with α = 0.05
• 2.326


  In a right tailed test with α = 0.01, the z-computes value is 1.682.

  What is the critical value?
• Do not reject the null hypothesis, hence the alternative hypothesis is unsupported 


  In a right tailed test with α = 0.01, the z-computes value is 1.682.

  What is your decision?
• μ ≥ 25 


  Which is the correct alternative hypothesis for a one-tailed test?
• Hypothesis 


  It is a proposed explanation, assertion or assumption about a population parameter or about the distribution of a random variable
• Hypothesis Testing 


  What is the statistical method used in making decisions using experimental data?
• Level of Significance 


  It is also the probability of commiting an incorrect decision about the null hypothesis
• The mean of a population is equal to 75


  Which of the following would be an appropriate null hypothesis?
• We reject a null hypothesis that is true


  When is a Type I error committed?
• We fail to reject a null hypothesis that is false


  When is a Type II error committed?
• μ 


  Which of the following population parameters is used as a symbol for the mean or average population?
• It describes the population 


  Which of the following statements best describes a parameter?
• μ


  Which of the following is a parameter?
• At least 700 ft


  A researcher estimates that the average height of the buildings in large city is at least 700 ft. Based on the given data, which is the perimeter?
• Mean 


  A motorcycle manufacturer advertises that its new subcompact models get 47 mpg. If μ is the mileage of these ears, what kind of perimeter is used?
• Left-tailed


  A vacuum cleaner consumes less than 46 kwh per year. What hypothesis test can you use in this claim?
• Less than


  The sign of alternative hypothesis in a left-tailed test is always?
• Null Hypothesis 


  What kind of hypothesis is illustrated in the statement below?

  "There is no significant difference between the average weekly allowances of morning and afternoon students in Mabunga Integrated High School"
• Alternative 


  "The introduction of the modern computers affects the performance of the students". What kind of hypothesis is it?