What is the expected charge of a Ga ion formed by loss of all its valence electrons?

What is the base name of a hydrocarbon with five carbon atoms and a single bond between them?

Every measurement consists of three parts. Which of the following is not one of them?

Which of these molecules contains an odd number of valence electrons, making it a free radical?

A transportation analyst studies the relationship between the arrival times of two buses, Bus A and Bus B, at a bus stop. She calculates the correlation coefficient between their arrival times to be \( r = 0.80 \). Based on this information, which of the following statements correctly interprets this finding?

An engineer wants to determine if a new alloy has a higher tensile strength than a standard alloy. The population standard deviations are known to be σ₁ = 5 MPa for the new alloy and σ₂ = 4 MPa for the standard alloy. Independent random samples are taken, with n₁ = 40 specimens of the new alloy having a mean tensile strength of X̄₁ = 150 MPa, and n₂ = 35 specimens of the standard alloy with a mean tensile strength of X̄₂ = 145 MPa. Using a significance level of α = 0.01, calculate the z-test statistic for testing whether the new alloy has a higher mean tensile strength than the standard alloy.

A shop owner uses linear regression to predict the number of ice cream cones sold based on the noon temperature. The regression line is fitted to the data. On a day when the noon temperature is 80°F, the residual is positive. What does a positive residual indicate in this context?

You are flipping a biased coin where the probability of landing heads is 0.6. If you flip the coin 10 times, what is the probability of getting exactly 7 heads?

Refer to the following description of a normal distribution curve.

A community program involves adult volunteers aged 21 and older who spend time with disabled senior citizens. Volunteers report the number of hours they work per week, ranging from one to nine hours. The program recruits volunteers among three groups: community college students, four-year college students, and non-students. A sample of 300 volunteers was taken, and the observed number of volunteers in each category is provided in the table below. Table: Number of Hours Worked Per Week by Volunteer Type (Observed Values) The program coordinators are interested in determining whether the number of hours volunteered is independent of the type of volunteer. They decide to calculate statistical measures and analyze the data to gain insights into volunteer behavior.   1. Based on the data provided, which volunteer type has the highest total number of volunteers? {#1} 2. What is the total number of volunteers who work 7–9 hours per week? {#2} 3. Among the three volunteer types, what is the median number of volunteers? {#3}