If the test is done at 95% confidence, the null hypothesis should

Q: A survey of 800 women shoppers found that 17% of them shop on impulse what is the 98% confidence…

A: Sol:- To calculate the 98% confidence interval for the proportion of women shoppers who shop on…

Q: You are a research assistant at a zoo.  The question of your study is "Has the proportion of baby…

A: Solution

Q: A clinical trial tests a method designed to increase the probability of conceiving a girl. In the…

A: Given,   The sample proportion is,

Q: A researcher conducts a hypothesis test to evaluate the effect of a treatment that is expected to…

A: From the given information, A researcher conducts a hypothesis test to evaluate the effect of a…

Q: A clinical trial tests a method designed to increase the probability of conceiving a girl. In the…

A:

Q: If the probability of mistakenly failing to reject the null hypothesis is 0.20, what is the…

A: A Type I error is when we reject a true null hypothesis. Lower values of α make it harder to reject…

Q: Let X be the mean of a random sample drawn form a population with a mean µ and variance o? =9. Find…

A: (Since it has been not mentioned which question so, as per our protocol we shall only answer the…

Q: You are asked to test the null hypothesis at the .05 level of significance and you end up with…

A: It is given that the z-observed value is -1.83.

Q: If the p-value found in an experiment is 0.85. We reject the null hypothesis. True False

A:

Q: A researcher expects a treatment to increase the scores for individuals in a population. The…

A: The objective of the question is to determine the statistical decision based on the result of a…

Q: A statistical test of hypothesis produces the P-value P = 0.221.  Will the null hypothesis be…

A: Given,P-value=0.221level of significance (α)=0.10

Q: when we will be reject the NULL HYPOTHESIS on the basis of

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: Find the P-value for a left-tailed hypothesis test with a test statistic if z=-1.26. Decide whether…

A: Given information- We have given a left-tailed hypothesis test. The value of the test statistics, z…

Q: Be able to determine the null hypothesis from a description of an experiment?

A: Hypothesis: Hypothesis is an assumption about the parameter of the population which will be made on…

Q: James is a school psychologist who wants to implement stress coping skills to help his students. His…

A: Here the direction of the test is to the left.

Q: a 90% confidence interval for for the probability of success in a Bernoulli trial with n=48

A: Confidence interval: It is defined as the range that contains the value of the true population…

Q: Which of the two hypotheses is the researcher always testing to reject or not?

A: The hypotheses are null and alternative hypothesis.

Q: Suppose we want to test the null hypothesis H0 : p = 0.60 against the alternative hypothesis Ha : p…

A: Given that  Null hypothesis H0: P=0.60 Alternative hypothesis H1: P<0.60   [ Left tailed test ]…

Q: The probability of rejecting a true null hypothesis is referred to as a Type II error. Select one: O…

A: The probability of rejecting a true null hypothesis is referred to as type II error. Select True or…

Q: If a treatment is expected to decrease scores on a variable for which the mean is expected to be…

A: Given: μ=50 If a treatment is expected to decrease scores on a variable, then the appropriate…

Q: what z value would make you reject the null hypothesis  u=52 at a 90% confidence level when the…

A: The alternative hypothesis is µ<52.

Q: In a statistical test, we have a choice of a left-tailed test, a right-tailed test, or a two tailed…

A: In a statistical test, there are two type of hypotheses. First one is null hypothesis, according to…

Q: Find the P value for a left-tailed hypothesis test with a test statistic of z=-1.17. Decide whether…

A: From the provided information, z = -1.17 The corresponding p value of the provided z score from the…

Q: A credit score is used by credit agencies (such as mortgage companies and banks) to assess the…

A: From the provided information, Sample size (n) = 39 Sample mean (x̄) = 719.9 Sample standard…

Q: Perform a 2-tailed z-test with a=D0.05 to determine if caffeine influences memory.

A: Z-test is a hypothesis test in which the z-statistic follows a normal distribution

Q: What is the p-value and the correct decision for this   test?

A: Given : n=50 , X=18 , p0=0.40 , α=0.05 Our aim is to find the p-value and the correct decision for…

Q: A researcher examines whether a majority of individuals prefer to wear their seat belts when driving…

A: Hypothesis testing is an act in statistics whereby an analyst tests an assumption regarding a…

Q: Last year's mean hourly wage (in dollars) for all hospital clerical workers in a large state was…

A: Given that  Last year's mean hourly wage (in dollars) for all hospital clerical workers in a large…

Q: A very large study showed that aspirin reduced the rate of first heart attacks by 44 %. A…

A: From the provided information,A very large study showed that aspirin reduced the rate of first heart…

Q: The type II error is also known as false positive or false alarm. Wrongfully failing to reject the…

A:

Q: Be able to state the null hypothesis for both one-tailed and two-tailed tests?

A:

Q: he lower end of the 95% confidence interval is Question Blank 1 of 2and the higher end of the 95%…

A: n=8 Sample sizex= 9.8 Sample mean s= 0.4 Sample standard deviation

Q: The one-tailed test only uses the null hypothesis whereas a two-tailed test uses both the null…

A: One tailed test :          The one tailed test  in which critical region is one sided it is either…

Q: A recent study suggested that 81% of senior citizens take at least one prescription medication.…

A: Claim: 81% of senior citizens take at least one prescription medication.  sample size (n) = 59 x =…

Q: As of 2012, the proportion of students who use a MacBook as their primary computer is 0.31. You…

A:

Q: When is it valid to use a one-tailed test? What is the advantage of a one-tailed test? Give an…

A: When the claim of the test is to test whether one quantity is more or less than the other quantity,…

Q: For the chi-square test of independence, how the hypothesis is formulated, and what are the expected…

A:

Q: The mean age of a bus driver in Chicago is 47.4 years. If a hypothesis test is performed to test the…

A: Claim: The mean age of a bus driver in Chicago is 47.4 years The null and alternative hypothesis is,…

Q: Researchers in Britain asked some people about their daily coffee intake. Of the 22 people from that…

A: Of the 22 people from that group who had the highest coffee intake, nine of them reported hearing…

Q: A type 1 error occurs when a treatment has an effect but the decision is to fail to reject the null…

A: Given : A type 1 error occurs when a treatment has an effect but the decision is to fail to reject…

Q: When the P - value is equal to the alpha level, the null hypothesis should be accepted.

A: P-value is the probability value which is derived from test statistic and it is useful to decide…

Q: If the F-statistic is close to one, what would be the decision of a hypothesis test?

A: The F-statistic is the test statistic for F-tests. In general, an F-statistic is a ratio of two…

Q: The currently used medicine is successful for 26% of patients. A new experimental medication is…

A: sample size(n)=500no.of patients successful for new experimental medication (X)=140sample proportion…

Q: An RA at the University of Baltimore has concluded that the difference between the mean GPA scores…

A: Type 1 error : - We we reject the true Null Hypothesis Type 2 error : - When we accept the false…

Q: A cereal company claims that the mean weight of the cereal in its packets is not 12 oz.  Identify…

A: It is given that the claim is that the mean weight of the cereal in its packets is not 12 oz.