Based on historical data at Oxnard College, we believe that 30% of freshman do not visit their counslors regularly. For this year, you would like to obtain a sample to estimate the proprotion of freshmen who do not visit their counslors regularly. You would like to be 98% confident that your estimate is within 5% of the true population proportion. How large of a sample size is required? Do not use mid-calculation n=

Q: What is the p-value for this sample? p-value = 0.2637× (Report answer accurate to 4 decimal places.)

A: The degrees of freedom is, df=n-1=98-1=97c is The degrees of freedom is 97. The test statistic is…

Q: During the last football season, the percentage of tight ends in the league who made a touchdown…

A: It is given that percentage of tight ends in the league that made a touchdown reception is 45%.

Q: a researcher reports an F-ratio with dfbetween =2 and dfwithin =30 for an independent measures ANOVA…

A: It is given that dfbetween = 2 and dfwithin=30.

Q: To build a 98% CI for the mean of a population, you take a random sample of 30 values and find s =…

A:

Q: The claim is that weights (grams) of pennies made after 1983 have a mean equal to 2.500 g as…

A: Answer - The claim is that weights of pennies made after 1983 have a mean equal to 2.5 g…

Q: In a large class of introductory Statistics​ students, the professor has each person toss a coin 33…

A: “Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: The claim is that for a smartphone​ carrier's data speeds at​ airports, the mean is μ=13.00 Mbps.…

A: Given information- Sample size, n = 29 Population mean, μ = 13 Mbps The value of test statistics =…

Q: Find the standard error of the mean for each sampling situation (assuming a normal population).…

A:

Q: A simple random sample of 400 individuals provides 100 Yes response.  What is the estimate of the…

A: We know that,  If P is population proportion and  p^ is sample proportion then standard error of…

Q: What sample size is needed to give a margin of error within ±3.5% in estimating a population…

A: Obtain the sample size of a preliminary estimate for p is 0.3 with the 99% confidence. The formula…

Q: What kind of statistical test is this? a. Is the test statistically significant? How do you know? C.…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: You are conducting a study to determine if there is a significant difference between average adult…

A: Solution: State the hypotheses. Null hypothesis: That is, there is no significant difference…

Q: "Suppose that in the past, 74% of all adults favored capital punishment. Do we have a reason to…

A:

Q: For a normal population with a mean equal to85and a standard deviation equal to10​,determine the…

A: Given Mean =85 Standard deviation=10 Sample size=20

Q: For a one-tailed test, the p-value is given by: a) the area under the curve between the mean and the…

A:

Q: You must state the Null and Alternate Hypotheses and describe the hypotheses. What is the Critical Z…

A:

Q: Given the situation or problem, determine what is being asked. a. Suppose a random sample of size n…

A: Given that   μ = 90 , ? = 6.4 , n = 25

Q: Since the Fair Labor Standards Act was passed in 1938, the standard work week in the United States…

A: For the given statement Select the correct choice

Q: The Nero Match Company sells matchboxes that are supposed to have an average of 40 matches per box,…

A: a. The significance level is given as 1%, so that it can be written as, α = 0.01.

Q: The average price for turnips in Animal Crossing: New Horizons is 95 bells. Samantha believes that…

A: Given that mu = 95 , x bar = 110 , s.d = 36, n = 20 , alpha =0.05 Carry out the hypothesis test…

Q: Is the statement below true or false? The distribution of the sample mean, x, will be normally…

A: Here  For sampling Distribution  As per Central limit theorem the Distribution of sample mean will…

Q: Are Republicans less likely than Democrats to display the American flag in front of their residence…

A:

Q: The Bangor Humane Society tracks cat adoptions closely, and in the past has seen 60% of people who…

A: Here we have to test: H0: P≥0.60  Vs  Ha: P<0.60 where P is true proportion of people's who…

Q: A recent Nielsen analysis found that the typical U.S. smartphone user is spending an average of 220…

A: The random variable time follows normal distribution. The sample mean is 205. The sample standard…

Q: A psychologist examined the effect of chronic alcohol use/abuse on memory. In this experiment, a…

A: From the provided information,

Q: Leading up to this past November’s election, suppose that two polls of randomly selected registered…

A: Given that  Sample sizes n1=140 , n2=100 Favorable cases x1=98 , n2=80 NOTE:- According to bartleby…

Q: Your state is considering raising the legal age for consumption of alcoholic beverages to 21 years…

A: p = 0.5 Margin of error = 0.01

Q: Calculate the standard score (z-score) of the given sample mean. Round your answer to two decimal…

A:

Q: Answer the Following Questions for no. 1 and show your clear solutions: A. Getting statistic from a…

A: A.

Q: (a) Find the standard error of the mean for each sampling situation (assuming a normal population).…

A: Farmula  Standard error=SE=σ/√n

Q: The Nero Match Company sells matchboxes that are supposed to have an average of 40 matches per box,…

A:

Q: mine the mean serum HDL cholesterol of all 20- to- 29 year old e mean serum HDL cholesterol of all…

A: Let X be the random variable such that serum HDL cholesterol of all 20 to 29 year old females. S:…

Q: What sample size is needed to give a margin of error within +4% in estimating a population…

A:

Q: Twenty-One samples of 100 items each were inspected when a process was considered to be operating…

A: It is given that there are 21 samples of 100 items each. That is, the total number of items is 2100.

Q: On Mary’s FACEBOOK page, there is a 42% chance that one of her friends will write on her wall. If…

A: Given : p = 0.42 n = 2400

Q: The operation Manager wants to have 95% confidence in estimating the proportion of non- conforming…

A: Significance level = 0.05, Margin of error = E = 0.05.

Q: What is the p-value for this sample? (Report answer accurate to four decimal places.)

A: mu = 84.3 xbar =94.2 SD = 18.6n = 8

Q: An initial time study was done on a process with the following results (in minutes). Based on the…

A: Average of Element 1: Avg1=4+3+5+4+35Avg1=3.8 Average of Element 2: Avg2=8+10+9+11+105Avg2=9.6…

Q: What sample size is needed to give a margin of error within +3% in estimating a population…

A: Given data, E=3%=0.03 z-value at 90% confidence is Zc=1.645 p=0.77 n=?

Q: 2. The average credit card dept for a recent year was P43,100. Three years earlier the average…

A: Given: X~Nμ,σ2X1=43100X2=41890n=50s1=s2=7810=s  (say)

Q: What happens to the t-distribution as the sample size increases?

A: As we know that the t-distribution is affected by the sample size. As sample size increases the…

Q: Why is obtaining the mean and standard deviation of xa first step in approximating the sampling…

A:

Q: d. If your sample size were doubled, how would you expect the value of S.D to change? How would the…

A: The standard deviation measure the dispersio of the data set with respect of the mean. It is…

Q: When is it appropriate to use the pooled two-sample t-methods? Choose the correct answer below. O A.…

A:

Q: A sample of n=10 scores has SS=74.What is the estimated standard error for the sample mean?

A: Givensample size(n)=10sum of squares(ss)=74

Q: Julie was testing how far two new electric cars-model A and model B-could drive on a full charge.…

A: Given n1=5 , Xbar1=168 , S1=5.4 n2=5 , Xbar2=172 , S2=7.5 H0:mu1-mu2=0  Vs   H1:mu1-mu2≠0 Alpha=0.05

Q: If the t-statistic for a single sample t-test is 1.58, what can you conclude? a. The test is…

A: Given information: t=1.58

Q: The managers of the Inlet Square Mall will keep their mall open if the mean population spending per…

A: From the provided information, Margin of error (E) = 3% Confidence level = 95%

Q: You run a fast-food restaurant and you are assessing the speed of service at your drive through…

A: Given: Population mean(μ)=50sample size (n)=30sample mean (x¯)=46standard deviation (s)=12

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.